Malicious PDF — malware analysis report

Static analysis result for SHA-256 a94f6c778517892d…

MALICIOUS

PDF

97.8 KB Created: 2021-03-31 12:13:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 3718974e8bdcb6011f4d23a6bf243077 SHA-1: 6e29b7c12e090d28ea738bf5936b7a08aed7851d SHA-256: a94f6c778517892dd495f028d833f693e236046f0859b2be2fa1510afb85b8d2
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document contains numerous external links, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious. The document body's mention of "blockchain book pdf download" combined with the embedded URLs suggests a phishing or malware distribution lure. The presence of PDF_SEO_LINK_FARM and SE_PAYMENT_REDIRECT_LURE heuristics indicates a tactic to generate traffic or redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise 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=blockchain+book+pdf+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4423471/normal_6025b2eb172ac.pdfIn PDF document text
    • http://vulgargirls.fun/692274345952efxs.pdfIn PDF document text
    • http://gachihyper.xyz/sony_crackle_tv_guidelpm0h.pdfIn PDF document text
    • https://jupufafel.weebly.com/uploads/1/3/2/7/132740723/zekurof.pdfIn PDF document text
    • https://nenovalo.weebly.com/uploads/1/3/2/7/132712003/nodalepedo-larowe-pogavuv-robivorusile.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450259/normal_6040b5579c978.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481663/normal_602627ff24551.pdfIn PDF document text
    • https://vokuduvalabi.weebly.com/uploads/1/3/4/5/134502282/90d9d76d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403533/normal_60292f7b5dcde.pdfIn PDF document text
    • http://bestcreditcheck.info/gifowesafumemuvujanowonjgzfp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426541/normal_602d3b1ad1678.pdfIn PDF document text
    • http://1xbets-regs.site/pentair_kreepy_krauly_parts_listw619v.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459328/normal_5fdb140c3e562.pdfIn PDF document text
    • http://crubr.space/wixofopufovulamuwiwadevufg6vkt.pdfIn PDF document text
    • http://insuranceautousa.com/98152718357t11u0.pdfIn PDF document text
    • https://bafupenog.weebly.com/uploads/1/3/4/1/134131575/bulikuzamebe-misixep-bosukasetuki.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485926/normal_5fcd57c74671e.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/megelugik/xaketo.pdfIn PDF document text
    • https://s3.amazonaws.com/vesubodufisi/windows_media_player_alienware_skins_free.pdfIn PDF document text
    • https://s3.amazonaws.com/perurulexi/exact_path_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/sefepugolupalax/maradona_malayalam_full_movie_sites.pdfIn PDF document text
    • https://s3.amazonaws.com/wukevirenesu/who_does_lara_jean_end_up_with_in_the_new_movie.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_off00013f43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F43 5316 bytes
SHA-256: 7ee1e22a79ccd99c8af5e3a9a77482bd02cdb4c625e99d32f09822b4b16e3524
font_01_sfnt_off00015165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15165 12032 bytes
SHA-256: efe187d1c9aed25aee09405b423d81cae98bb538c13c389db86c9c8e1668878d