Malicious PDF — malware analysis report

Static analysis result for SHA-256 fab7519b499503c5…

MALICIOUS

PDF

76.8 KB Created: 2021-02-11 20:55:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 867f874d0b4194ba6002d7e4c8e70f79 SHA-1: fd1d946f49386aa6ae687a0b716e7cc3f3c4a021 SHA-256: fab7519b499503c5aac58d6ef837d5332ece4346e1980965d2c260682ab4c6a8
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external links, including one to 'bologen.ru', suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, appears to be a lure related to a 'Spanish 2 study guide'. No scripts were extracted, but the PDF structure itself facilitates redirection to malicious sites.

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.
  • 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://bologen.ru/wix?keyword=spanish+2+study+guide+2nd+semester PDF link annotation
    • https://cdn.sqhk.co/mumesimasozo/cB7hgZD/national_test_abhyas_login_on_laptop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447877/normal_601e50a73aa87.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405930/normal_5ff48cad8c9fc.pdfIn PDF document text
    • https://cdn.sqhk.co/sixepatexup/jjhfhjt/zombs_royale_unblocked_66.pdfIn PDF document text
    • https://cdn.sqhk.co/fipuwemupe/hcbIICU/scrabble_word_finder_maker.pdfIn PDF document text
    • https://lozuninusagutog.weebly.com/uploads/1/3/5/3/135309735/gibukefugin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465006/normal_5fd7c88fd124d.pdfIn PDF document text
    • https://poxemitiwafu.weebly.com/uploads/1/3/1/8/131871555/b00b5.pdfIn PDF document text
    • https://jimekomu.weebly.com/uploads/1/3/1/4/131453536/mubovep_funelovareke.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497131/normal_6011900b8be7c.pdfIn PDF document text
    • https://cdn.sqhk.co/jesupasuzoku/LgicDgf/3217229476.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406454/normal_60251261b2d41.pdfIn PDF document text
    • https://cdn.sqhk.co/jagojixego/gj6bwz7/82588797785.pdfIn PDF document text
    • https://cdn.sqhk.co/fukafodifi/hdQNXcw/7811780868.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415300/normal_6024cc2b1d75a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370089/normal_60098457cffd2.pdfIn PDF document text
    • https://cdn.sqhk.co/milibotobov/u1Agcig/monkey_ropes_course_new_hampshire.pdfIn PDF document text
    • https://sozazoje.weebly.com/uploads/1/3/1/1/131164180/4236527.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/panokojol/acrylic_sheet_supplies_melbourne.pdfIn PDF document text
    • https://s3.amazonaws.com/bomifabipi/nowafe.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_off0000e95f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE95F 5680 bytes
SHA-256: ef5110f0ed6c941ba8729bcd4d309ca4de7e21d7491ad4fc5583ff930f720082
font_01_sfnt_off0000fc89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC89 12796 bytes
SHA-256: 390d411db71a0de71098f968cf3d852d9bf7609fe8c3a62d943779831dc0fc06

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