Malicious PDF — malware analysis report

Static analysis result for SHA-256 b67f9f1d92a67d76…

MALICIOUS

PDF

74.6 KB Created: 2021-03-28 23:54:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b6071365823b47bfe1c84326af826e9b SHA-1: 22cf3d7e7bc6c29904f5729bad27a1b7b7b4f3e2 SHA-256: b67f9f1d92a67d768821939a350c9c691f39d61ba0169ae4278b5fbc757d3b65
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains a large number of external links pointing to other PDF files hosted on various domains, indicating a link farm designed to distribute malicious content or lead users to phishing sites. The primary URL observed is zajinet.ru, which is part of this distribution network.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://zajinet.ru/award?keyword=project+on+work+life+balance+of+employees+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4450337/normal_5fdb544749764.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486053/normal_602a4f482c7b5.pdfIn PDF document text
    • https://xujuzulixup.weebly.com/uploads/1/3/3/9/133999631/3452819.pdfIn PDF document text
    • http://dapajurop.mygamesonline.org/ccim_bams_syllabus.pdfIn PDF document text
    • https://cdn.sqhk.co/nasubivapu/gjhcYP2/44766902827.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372983/normal_5fe01dac96f49.pdfIn PDF document text
    • http://nafarami.medianewsonline.com/gnostic_bible_verses.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408599/normal_5fdb8cd06d604.pdfIn PDF document text
    • https://cdn.sqhk.co/rigizisojix/hbgjjcd/vinovuxivoworu.pdfIn PDF document text
    • https://cdn.sqhk.co/xifobariw/d9aFhb4/najorovipexokojazinem.pdfIn PDF document text
    • https://xefitopabez.weebly.com/uploads/1/3/4/8/134865339/bejuropikavimuj.pdfIn PDF document text
    • https://cdn.sqhk.co/molivovuki/jcF6myh/paypal_prepaid_card_won_t_activate.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495684/normal_5fcb1e419e4e1.pdfIn PDF document text
    • https://bamopinusomuna.weebly.com/uploads/1/3/1/3/131379567/1636119.pdfIn PDF document text
    • https://zoxipunawogedo.weebly.com/uploads/1/3/4/2/134235683/4bb76eeed3.pdfIn PDF document text
    • https://cdn.sqhk.co/mitukutowum/eiijghe/45655987424.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE705 5776 bytes
SHA-256: 3466eb368bf5b07743ec968537ec2be8c9266a3255b687f8611275f3079fb4e6
font_01_sfnt_off0000fab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB7 10108 bytes
SHA-256: 3d1d594353cc9c8aa36998837f4790b9ffde26528e6446a6dbab919b31aa225a

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