Malicious PDF — malware analysis report

Static analysis result for SHA-256 c61deaa7da1ee2f4…

MALICIOUS

PDF

78.3 KB Created: 2021-04-02 06:11:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 08e18f82df0a7ec25b32646de4dcab2f SHA-1: 53d705ca5ea9fbd6b9357fcad661fcdd0fa3b694 SHA-256: c61deaa7da1ee2f41635e1b620de2d1891343ad88a4de2737ded50be419a46a5
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • 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.
  • 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://resalured.ru/award?keyword=aadhar+card+download+pdf+without+mobile+number PDF link annotation
    • https://nofixemi.weebly.com/uploads/1/3/6/0/136082439/donowejitok.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405929/normal_603f1c56e1c6c.pdfIn PDF document text
    • https://suxasamivozafe.weebly.com/uploads/1/3/4/7/134705269/tuwezupob_surofesute_xamegedenuzav.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465131/normal_60225f49b3e3e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489615/normal_604cf0e8b8972.pdfIn PDF document text
    • http://ritibaj.22web.org/jukebox_hero_sheet_music.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417128/normal_600f03e5125af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473926/normal_604dd79d77d86.pdfIn PDF document text
    • http://waxodotira.22web.org/active_learning_methods.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451565/normal_6032333c5da47.pdfIn PDF document text
    • https://buwigare.weebly.com/uploads/1/3/5/3/135308802/64a79fc473dc55.pdfIn PDF document text
    • https://julasunanuk.weebly.com/uploads/1/3/4/3/134308365/4967425.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381536/normal_5feafcc88a4d1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406501/normal_5ffe7415d8710.pdfIn PDF document text
    • http://pakamid.22web.org/guidelines_for_keeping_child_home_from_school.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372960/normal_603b7d18d428d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375199/normal_5ff9d99953c39.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479678/normal_5ff1f6c509967.pdfIn PDF document text
    • https://ligibokone.weebly.com/uploads/1/3/1/8/131858045/7829351.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/049fbe42-bfdf-439d-b907-8960a4bb4802/kozofa.pdfIn PDF document text
    • http://diruxepuf.epizy.com/fedloan_forgiveness_for_disabled_veterans.pdfIn PDF document text
    • http://fujalur.epizy.com/mesiwax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/602a6dca-ebd4-4aba-94ba-037bcd5369b1/how_to_convert_rslogix_5000_to_studio_5000.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_off0000f3ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CE 5436 bytes
SHA-256: 19733f484c786503ecead9d47e8e7a0a6aa1281d3fe872b7a731ac80aa319650
font_01_sfnt_off00010636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10636 10756 bytes
SHA-256: 5bcb9409cb9220e3644d6d5b840bea9aa5ac36a558603f7736aeb589d59ae383