Malicious PDF — malware analysis report

Static analysis result for SHA-256 31af26f39d882415…

MALICIOUS

PDF

62.8 KB Created: 2020-11-20 19:47:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 120396c65dc378ea1b050805432cdec0 SHA-1: df68157ef2f2097ef746306acf00ca1009282e1e SHA-256: 31af26f39d8824150335a318d54c9af184669cc62cb0bfe3577b942a3237f338
206 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. One prominent URL is trafffi.ru, which is likely used to redirect users to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://trafffi.ru/123?utm_term=sony+ericsson+walkman+flip+phone+charger PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369633/normal_5f87ec3fa5caf.pdfIn PDF document text
    • https://ziwirekow.weebly.com/uploads/1/3/4/5/134529616/renuxak-zofugojibir-pizeridimamam-vowaso.pdfIn PDF document text
    • https://xupuxagezizese.weebly.com/uploads/1/3/4/6/134613092/bitaronesogep_nejitapir_talebij_nunimorosubutof.pdfIn PDF document text
    • https://nimefoxigobaki.weebly.com/uploads/1/3/4/8/134847293/fofobemafurariw_punax_danemosi.pdfIn PDF document text
    • https://vaxedokumam.weebly.com/uploads/1/3/4/2/134266394/watezemage.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366316/normal_5f8e115845bde.pdfIn PDF document text
    • https://muwamobole.weebly.com/uploads/1/3/4/3/134356931/1d6017.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401696/normal_5f91abf3ee610.pdfIn PDF document text
    • https://rovemijiv.weebly.com/uploads/1/3/4/3/134343091/xavanivodugi_vixeg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447880/normal_5fa6b5c42f18d.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/sinadi/mulunitunegomijimavonu.pdfIn PDF document text
    • https://s3.amazonaws.com/falufusu/nanugoxisiluwadizu.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b8d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8D5 5788 bytes
SHA-256: 5cdb8e82958bb2f0a5f4b2fefadbf3e2ecfde26da96b3f057bf6232bf818104f
font_01_sfnt_off0000cc85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC85 9920 bytes
SHA-256: 2c355414e50e2bc66525d8eb817e009e50d5ecb3ad0f941427a9d3db06a220c9

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