Malicious PDF — malware analysis report

Static analysis result for SHA-256 39a70b6cc8218f61…

MALICIOUS

PDF

74.2 KB Created: 2021-03-04 07:31:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 5a7f94a97fd096d0608f11f0056a50eb SHA-1: a266616ea1af18155d26e1eb9cd08b410a35ca25 SHA-256: 39a70b6cc8218f612cbc18fd8d0776ba3bae65579dc92b22e4bc47149a3dcb28
176 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains a large number of external links, many pointing to PDF files, suggesting a link farm or redirection mechanism. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a parts manual, likely a pretext to disguise malicious intent. The presence of numerous external URLs indicates an attempt to redirect the user to potentially harmful content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://kuzutuzo.ru/123?utm_term=massey+ferguson+3545+parts+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4421782/normal_601dc318d2aa4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405195/normal_6039155b6ef34.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376127/normal_5fff515bb7f93.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450147/normal_6037c1917ba03.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470972/normal_5fde83b1585d6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457857/normal_5fe25b7c909b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401973/normal_6013611f9ef5f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418972/normal_601c7048703db.pdfIn PDF document text
    • https://tidijesugeji.weebly.com/uploads/1/3/4/7/134764535/0a38afb.pdfIn PDF document text
    • https://wirosumarot.weebly.com/uploads/1/3/1/3/131398493/7f092f71a71d99f.pdfIn PDF document text
    • https://gidedumewulo.weebly.com/uploads/1/3/5/9/135961218/7335597.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415051/normal_5fd5f2f3586b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383561/normal_60271ad24abe3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411229/normal_602870480c51c.pdfIn PDF document text
    • https://gulekikafosevog.weebly.com/uploads/1/3/2/3/132303175/wegedum.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487419/normal_6032ba87e0dc8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vebenok/ccmta_driving_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/ginutu/14364672705.pdfIn PDF document text
    • https://s3.amazonaws.com/vovabagubajegeb/how_to_talk_to_a_live_person_at_nc_dmv.pdfIn PDF document text
    • https://s3.amazonaws.com/teximikamukubo/partnership_deed_format_in_word_latest.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e27f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE27F 5704 bytes
SHA-256: fa0d92ed8c3e137431fc087e5fd0b2fcc76effd88b82a28253801b05da01943c
font_01_sfnt_off0000f5fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5FD 11044 bytes
SHA-256: 96d32be16369550e308a4af7d22b7bc6d09a258f3640684332e33e11ddba6fcb

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