Malicious PDF — malware analysis report

Static analysis result for SHA-256 412725ea6a9c351d…

MALICIOUS

PDF

76.3 KB Created: 2021-02-26 10:44:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: b7716c8d0ef4e7a6d97923676a4c2bfb SHA-1: 7ac6753d4698b375beb7b4be69ae690693c49bdf SHA-256: 412725ea6a9c351de064318ab89ab33c0dc93b9586c18aaf2c10ed4a12dfa83b
126 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM suggests the document is part of a link farm designed to host disposable URLs, and one such URL points to a page that appears to be an interview email template. The embedded URLs likely lead to further malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://jacksth.ru/award?keyword=m-audio+axiom+61+midi+keyboard+price PDF link annotation
    • http://wrinklestiltskin.com/interview_email_template_for_employers7rsbc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492240/normal_6024cd4928925.pdfIn PDF document text
    • http://want-seo.ru/rozawodafebuze2uu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463306/normal_5fe610fe73342.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366057/normal_5fe8f4fc98034.pdfIn PDF document text
    • http://forkidsshop.online/zixametetadulinifunygk2.pdfIn PDF document text
    • http://tederurokeroga.iblogger.org/94037206944.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501791/normal_6037d10d9748d.pdfIn PDF document text
    • https://cdn.sqhk.co/vovawumusa/jb3jdbY/8898929840.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366646/normal_601db9ccc3cee.pdfIn PDF document text
    • http://skidki-day.shop/34839844021pkjhl.pdfIn PDF document text
    • https://cdn.sqhk.co/vowibesep/6fCDdhh/73343354784.pdfIn PDF document text
    • http://usersdeviceprotectionservice.site/miniature_dachshund_puppies_for_sale_texaszd4rr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383566/normal_601ae1528e6fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487662/normal_60214ed3c0464.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500429/normal_5fc9ab39f12ac.pdfIn PDF document text
    • http://pressit.space/update_mysql_database_php_formnpxj4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448743/normal_60163e93e10f8.pdfIn PDF document text
    • https://cdn.sqhk.co/fusuwudofal/bUoHjji/kutigi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zoratazux.epizy.com/dusuwo.pdfIn PDF document text
    • http://wubavon.epizy.com/biwatefi.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_off0000ec0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0C 5624 bytes
SHA-256: e21d39803c88b7f04dd89bdd886ed8febf85f90ee0cd16b0ad14e59f21f96e33
font_01_sfnt_off0000ff3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3D 10732 bytes
SHA-256: a1a873ee586b23dd88a6388c511e17ea886344c66dba4513174ca639755c1d0f

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