Malicious PDF — malware analysis report

Static analysis result for SHA-256 57c3b39f255b5dd9…

MALICIOUS

PDF

75.4 KB Created: 2021-04-05 12:47:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 3e810d987ad502149639b1ca2dc25890 SHA-1: ee8d914219b743e7701f5a33a7a65054c13d2096 SHA-256: 57c3b39f255b5dd914a9c9debeb59a00653b929610823f166f8b809486bbf778
344 Risk Score

Malware Insights

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

This PDF document contains embedded JavaScript and numerous links to external PDF files, many hosted on disposable domains. The document body and embedded script metadata suggest a lure related to "Windows powershell pdf free download", aiming to trick users into clicking malicious links. The embedded script and the high number of external links indicate an attempt to redirect users to malicious infrastructure, likely for further payload delivery or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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.
  • 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://crophysi.ru/strik?utm_term=windows+powershell+pdf+free+download In PDF document text
    • http://jaxagogilexet.sportsontheweb.net/fajutow.pdfIn macro / runtime command snippet
    • https://delovamubikener.weebly.com/uploads/1/3/4/7/134707073/mokojakabenib.pdfIn macro / runtime command snippet
    • http://gifagudilul.mypressonline.com/elder_scrolls_arena_world_map.pdfIn PDF document text
    • https://dijajogid.weebly.com/uploads/1/3/0/8/130874349/9cf54c4a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499021/normal_601344f514ef2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367920/normal_5ffb66ceaf188.pdfIn PDF document text
    • http://xomerisupudegop.medianewsonline.com/25164385518.pdfIn PDF document text
    • https://mowofagafuvu.weebly.com/uploads/1/3/4/5/134594922/f5128a5e6c8fc4.pdfIn PDF document text
    • http://fafesixokegigi.getenjoyment.net/mini_dv_tape_player_deck.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490974/normal_606aba59e5a6c.pdfIn PDF document text
    • https://tujiniwiko.weebly.com/uploads/1/3/5/3/135350236/009b21374e0e394.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vifowas.epizy.com/advocacy_journalism.pdfIn PDF document text
    • https://64e18f06-8a0e-4dc1-8427-9dd81b4bff36.filesusr.com/ugd/baa514_b4152b1a8f58440d8645121d7e17effb.pdf?index=trueIn PDF document text
    • https://4b523d79-2bc6-404f-8e52-0acae4d2cb03.filesusr.com/ugd/fe1b41_7bb245f224f344f6b4f5c7818193e590.pdf?index=trueIn PDF document text
    • https://6131fb9f-3080-406c-a6ab-c4686b6a2f6f.filesusr.com/ugd/52be6f_ac172f5b4d3c4b0f80f82e14839af3fa.pdf?index=trueIn PDF document text
    • https://ac65beef-1c88-4b01-a948-251493ed82f2.filesusr.com/ugd/09857b_0864f05b97dd4cd9af4840d9837c07d7.pdf?index=trueIn PDF document text
    • https://a6047d18-b57f-4fdc-88fa-dea7715a8642.filesusr.com/ugd/189347_7bde8c0c591b41ac830ffe818e3ffb1b.pdf?index=trueIn PDF document text
    • http://bigamutalunu.atwebpages.com/zoology_textbook_download.pdfIn PDF document text
    • https://58f604bd-1fd8-4cfe-af9b-f15e67d030d5.filesusr.com/ugd/9a7439_c8d1e33f7e6e438bbdb2eb267ed1c9f0.pdf?index=trueIn PDF document text
    • http://wowesuwufurofak.rf.gd/ponuzadivifivobulilutusuf.pdfIn 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://vifowas.epizy.com/advocaIn macro / runtime command snippet
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_pdf_script_00012807.bin pdf-embedded-script PDF raw stream script payload at offset 0x12807 1608 bytes
SHA-256: cfc85ac0f560a93a10fccd0629af57654bc8f60f3d99ef2ea9842905151e78f4
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='Nitro PDF'>
<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>Fukocafi Kenatite</rdf:li>
   </rdf:Seq>
  </dc:creator>
  <dc:description>
   <rdf:Alt>
    <rdf:li xml:lang='x-default'>Windows powershell pdf free download.  ApowerMirror is one of the most popular screen mirroring apps for iOS and Android devices. With thi</rdf:li>
   </rdf:Alt>
  </dc:description>
  <dc:subject>
   <rdf:Bag>
    <rdf:li>Windows powershell pdf free download.  ApowerMirror is one of the most popular screen mirroring apps for iOS and Android devices. With thi</rdf:li>
   </rdf:Bag>
  </dc:subject>
  <dc:title>
   <rdf:Alt>
    <rdf:li xml:lang='x-default'>Windows powershell pdf free download</rdf:li>
   </rdf:Alt>
  </dc:title>
 </rdf:Description>

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

 <rdf:Description rdf:about=''
  xmlns:xmp='http://ns.adobe.com/xap/1.0/'
  xmp:CreateDate='2020-06-05T19:06:03'
  xmp:CreatorTool='Nitro PDF'/>

 <rdf:Description rdf:about=''
  xmlns:xmpMM='http://ns.adobe.com/xap/1.0/mm/'
  xmpMM:DocumentID='385ea822-9ec8-4e47-abdb-daac5b5c2452'
  xmpMM:InstanceID='6cf3744c-2b67-4fea-9339-d77cba05ad98'/>

 <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_off0000eadf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADF 5232 bytes
SHA-256: 452441497410172c7e7ba69eaca6bb29621d89f597f8055ca702f181426d1cf2
font_01_sfnt_off0000fcc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC0 10448 bytes
SHA-256: a640ede1f24d6b8c494d289b7e19e7a6569dd1186ca79ef1606d4b8eb97b75d8

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