Malicious PDF — malware analysis report

Static analysis result for SHA-256 4425e53d8f7831fc…

MALICIOUS

PDF

97.6 KB Created: 2021-03-02 03:24:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: e5705912d0a3f6baf5674304b67a60d5 SHA-1: 285433f8060a2dd38dd8900a9b5b86c0aa6a800b SHA-256: 4425e53d8f7831fcaf9b408c5d6b90e270687472c363351d5827e164b5e6767c
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript that, combined with heuristic firings like PDF_EMBEDDED_SCRIPT_PAYLOAD and ML_NYX_PDF_MALICIOUS, indicates malicious intent. The document body and embedded URLs suggest a lure related to 'SQL server dba documentation pdf' to trick users into visiting a malicious URL, likely to download a secondary payload. The ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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.
  • 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://druttle.ru/strik?utm_term=sql+server+dba+documentation+pdf PDF link annotation
    • https://jepifobowokeba.weebly.com/uploads/1/3/0/7/130776363/fewipiderabamo_pagiw_bomufadizazoxuv_guwolisufub.pdfIn PDF document text
    • http://mosebuzixat.mywebcommunity.org/frayer_model_template_math.pdfIn PDF document text
    • http://fofiwafajelerax.sportsontheweb.net/20626451781.pdfIn PDF document text
    • http://uscarins.info/225927622505ec47.pdfIn PDF document text
    • http://airbin.top/what_golf_club_do_you_use_to_tee_offok40c.pdfIn PDF document text
    • http://salebox.shop/15443536862gndnp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375716/normal_5fd1783e0f829.pdfIn PDF document text
    • http://gonzo-3d.com/54374145462usnso.pdfIn PDF document text
    • http://serviceforyou.site/12604228778nlypd.pdfIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wanasuvedigo/kaniligiv.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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00012954.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12954 13556 bytes
SHA-256: 2f0e80cd462277f21b7096e3b4a912af266572a9024c8fac3bc434c604afaf7d
embedded_pdf_script_00018191.bin pdf-embedded-script PDF raw stream script payload at offset 0x18191 1585 bytes
SHA-256: a4ec6e8ccf893bf9a05af94390f48cc0fd6e0a09613c8ebf868fdd2776bd0862
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 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='PDFBox'>
<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>Xejizuso Zorehe</rdf:li>
   </rdf:Seq>
  </dc:creator>
  <dc:description>
   <rdf:Alt>
    <rdf:li xml:lang='x-default'>Sql server dba documentation pdf. For SQL Server, I am using additional properties with the following PowerShell scripts. Additional t</rdf:li>
   </rdf:Alt>
  </dc:description>
  <dc:subject>
   <rdf:Bag>
    <rdf:li>Sql server dba documentation pdf. For SQL Server, I am using additional properties with the following PowerShell scripts. Additional t</rdf:li>
   </rdf:Bag>
  </dc:subject>
  <dc:title>
   <rdf:Alt>
    <rdf:li xml:lang='x-default'>Sql server dba documentation pdf</rdf:li>
   </rdf:Alt>
  </dc:title>
 </rdf:Description>

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

 <rdf:Description rdf:about=''
  xmlns:xmp='http://ns.adobe.com/xap/1.0/'
  xmp:CreateDate='2020-05-25T09:16:55'
  xmp:CreatorTool='PDFBox'/>

 <rdf:Description rdf:about=''
  xmlns:xmpMM='http://ns.adobe.com/xap/1.0/mm/'
  xmpMM:DocumentID='ffad5bf3-ce5c-4684-942f-14c8ef181daa'
  xmpMM:InstanceID='d1b354a2-5ea5-45b3-869d-5380885dbdde'/>

 <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_off000115f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115F2 5732 bytes
SHA-256: 2252dfbc2c99dbac9386c413ec980d4f915dfe2a44956f1652f86a1e16bef174
font_02_sfnt_off00014f86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F86 12344 bytes
SHA-256: 8cadbc07a0a6aaf62db3064dd1eda9bcc3c89839a43ecf7026dcfabe3bceb5a4

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