Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4a16f615985da88…

MALICIOUS

PDF

67.3 KB Created: 2020-12-01 06:05:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: c337b8fe0f8ee899260f4009d5131c0c SHA-1: 5c81f83e2a9b9b0cc8e342eeab189209441f0e4f SHA-256: a4a16f615985da884ba0a1cfce2015fe02b42c620cc9aae85953699722e04a1a
176 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one identified as a potential lure for phishing or malware distribution. The 'SE_CALLBACK_LURE' heuristic suggests a pattern consistent with callback phishing or tech-support scams. While no scripts were explicitly extracted, the PDF structure and link farm heuristic indicate malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffnew.ru/123?utm_term=diabetes+quotes+funny PDF link annotation
    • https://wibanakipose.weebly.com/uploads/1/3/4/3/134361509/4b0fe8f1e6e607.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/wodox_wodapugasexirid_dazukirivazapa_vodewese.pdfIn PDF document text
    • https://seperabe.weebly.com/uploads/1/3/4/7/134714478/tipimofeliduros-nawedovipibox.pdfIn PDF document text
    • https://zelapagetuwuj.weebly.com/uploads/1/3/1/4/131406140/muruwuximusovid.pdfIn PDF document text
    • https://vudexomitimezi.weebly.com/uploads/1/3/4/7/134717123/9f8ed67934bce2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd03651af5bf52c3280bed/1606222694237/21378357801.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc12df85bcb0228a284406c/t/5fc34f06145a8629dc1ad55b/1606635270568/the_rock_wwf.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf58ca61e25426e12fcdcd/1606375627585/golds_gym_xrs_20_weight_bench_parts.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0fe386b97992eb55c938e/t/5fc3ceb13c6ccf69f3d2e4a6/1606667953981/47670206536.pdfIn PDF document text
    • https://s3.amazonaws.com/nimuwet/dogijolijejopezokurilidiv.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0e335a5bc066edfa5a857/t/5fc14084a97599144e255baf/1606500485901/watexewatujifux.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc36f132e537a05ef193780/t/5fc4467c173fb5383b2b42ac/1606698621083/espn_arcade_smash_and_blast_baseball.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_off0000cd24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD24 5000 bytes
SHA-256: ebb4d1027561f4eb55e810f21a3616da8ef6b1ab317d957317095ae330932c9e
font_01_sfnt_off0000de50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE50 10116 bytes
SHA-256: 1da13773d3edba0dc088b8fec312f67c8b71cb4bd5dc187605626a050c980d8d

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