Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1da2c933fd4b820…

MALICIOUS

PDF

76.7 KB Created: 2021-03-27 21:47:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 792680327422f5306039880a3845232c SHA-1: 844aafc7719b87b105eac0222c0456be7486e101 SHA-256: d1da2c933fd4b82090b5b852e1bc07bfb31d8373a70293ece1ae8e204f0b50ae
294 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains an embedded script that likely attempts to download and execute a secondary payload. The document also contains heuristics indicating it's part of a link farm designed to host malicious content, and it explicitly lures the user into executing commands via the clipboard. The presence of an embedded script and the link farm structure strongly suggest a malicious intent to compromise the user's system.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 10

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Embedded script payload in PDF stream high PDF_EMBEDDED_SCRIPT_PAYLOAD
    PDF stream bytes contain script execution markers such as ActiveXObject/CreateObject, WScript.Shell, PowerShell, or shell-exec primitives. This is stronger than ordinary PDF JavaScript because it indicates a staged external script payload hidden in stream bytes.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Suspicious extracted artifact medium EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://vilenefex.ru/aws?utm_term=learn+powershell+scripting+in+a+month+of+lunches+1st+edition+pdf PDF link annotation
    • https://subamepowesita.weebly.com/uploads/1/3/4/8/134875458/wuxereramepepelur.pdfIn PDF document text
    • https://jojapewabivato.weebly.com/uploads/1/3/1/3/131379205/85a9f3.pdfIn PDF document text
    • https://jowidizikut.weebly.com/uploads/1/3/0/8/130874332/3aa85927.pdfIn PDF document text
    • http://firstsecu-paypal.com/how_to_workout_your_legs_with_weightswmt8s.pdfIn PDF document text
    • https://nuguviroguzemek.weebly.com/uploads/1/3/1/0/131070089/afc185e9c.pdfIn PDF document text
    • https://gavatuwideziwi.weebly.com/uploads/1/3/4/3/134352821/d34b3c8fb.pdfIn PDF document text
    • http://letxxnx.org/mowajaxipasmmhj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/gixawetopoli/niripexebobabu.pdfIn PDF document text
    • https://3e1d1bad-f645-4ebd-ac75-469e7ff7c972.filesusr.com/ugd/e745be_07723b7c9dc1433b9a17a9fb20c80f49.pdf?index=trueIn PDF document text
    • https://29ca30ec-7ad4-487f-8637-d2d67f3a323c.filesusr.com/ugd/10b11f_3eeca280a442419a98b1e0733f88cbca.pdf?index=trueIn PDF document text
    • https://cf336f9a-6a79-4542-9269-5b62d6eb69dd.filesusr.com/ugd/1daf83_bf3a0c4e1ec94ceb987b304a038604aa.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac27c40d-c78e-44fc-93d8-10165d52c146/the_redemption_project_season_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbe1a486-0ac0-4f4d-a2ee-f8d3182f4eb0/56641589465.pdfIn PDF document text
    • https://s3.amazonaws.com/mafavuzenoliki/funokevu.pdfIn PDF document text
    • https://43081b45-6e48-4b43-b724-9328fda377ae.filesusr.com/ugd/26481d_3f833424a8b242db924ef7cc391e4adf.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/41a60dfb-33c5-474c-a565-eea2705f48bf/22898002774.pdfIn PDF document text
    • https://s3.amazonaws.com/dugibabafod/46934847157.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45f22e25-989a-4c5d-9088-b7bee1438e08/zokezajepidimanoxojoribir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10a90ff9-254c-4275-8efc-7fdb49fc42eb/roremabobixusuwa.pdfIn PDF document text
    • https://5c90cfa9-af55-48e2-9430-1f3580382729.filesusr.com/ugd/e2b09b_8ccaf2d4ec1a4666b2c978b9ddcc9075.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_pdf_script_00012d1e.bin pdf-embedded-script PDF raw stream script payload at offset 0x12D1E 1669 bytes
SHA-256: 302f04858175271eaa8ed6f5c81d210fba982385366fbf4880d9bdd810ed7bb7
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 3 shell/COM execution token(s).
Preview script
First 1,000 lines of the extracted script
<?xpacket begin='' id='W5M0MpCehiHzreSzNTczkc9d'?>
<x:xmpmeta xmlns:x='adobe:ns:meta/' x:xmptk='GIMP'>
<rdf:RDF xmlns:rdf='http://www.w3.org/1999/02/22-rdf-syntax-ns#'>

 <rdf:Description rdf:about=''
  xmlns:dc='http://purl.org/dc/elements/1.1/'
  dc:format='application/pdf'>
  <dc:creator>
   <rdf:Seq>
    <rdf:li>Yiruxiwe Tomufi</rdf:li>
   </rdf:Seq>
  </dc:creator>
  <dc:description>
   <rdf:Alt>
    <rdf:li xml:lang='x-default'>Learn powershell scripting in a month of lunches 1st edition pdf.        Don Jones (Author)   Jeffery Hicks (Author)      Price    .99   Publisher Manning Publicat</rdf:li>
   </rdf:Alt>
  </dc:description>
  <dc:subject>
   <rdf:Bag>
    <rdf:li>Learn powershell scripting in a month of lunches 1st edition pdf.        Don Jones (Author)   Jeffery Hicks (Author)      Price    .99   Publisher Manning Publicat</rdf:li>
   </rdf:Bag>
  </dc:subject>
  <dc:title>
   <rdf:Alt>
    <rdf:li xml:lang='x-default'>Learn powershell scripting in a month of lunches 1st edition pdf</rdf:li>
   </rdf:Alt>
  </dc:title>
 </rdf:Description>

 <rdf:Description rdf:about=''
  xmlns:pdf='http://ns.adobe.com/pdf/1.3/'
  pdf:Producer='GIMP'/>

 <rdf:Description rdf:about=''
  xmlns:xmp='http://ns.adobe.com/xap/1.0/'
  xmp:CreateDate='2020-10-05T18:26:44'
  xmp:CreatorTool='GIMP'/>

 <rdf:Description rdf:about=''
  xmlns:xmpMM='http://ns.adobe.com/xap/1.0/mm/'
  xmpMM:DocumentID='425f0972-2ada-431a-8f6e-0613a419dc3c'
  xmpMM:InstanceID='0119c1ca-fc5b-4416-a817-f74d825c02b3'/>

 <rdf:Description rdf:about=''
  xmlns:xmpRights='http://ns.adobe.com/xap/1.0/rights/'
  xmpRights:Marked='True'/>
</rdf:RDF>
</x:xmpmeta>
<?xpacket end='w'?>
font_00_sfnt_off0000df0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF0D 5536 bytes
SHA-256: a768cd3069e5e5d6318b20ca90c77637c6ec97845b3df8d286c65bf31968eeec
font_01_sfnt_off0000f1c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C7 10908 bytes
SHA-256: f8ca16c195e90b3469de8efaec2603cd3972e9318180e4b8463dc94a71aa58e7
font_02_sfnt_off000116f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F7 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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