Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba3cfc87980f4aa1…

MALICIOUS

PDF

71.4 KB Created: 2021-05-12 07:36:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 0ece32099c4b60bc3096949a9df67dfa SHA-1: b2d91ab9a815f95586685e36bf9a9ed1314d4c33 SHA-256: ba3cfc87980f4aa13427067d26969d98c50adf56e2b13459c6d653e930ad2047
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://kuzutuzo.ru/strik?utm_term=rmv+id+requirements PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4388178/normal_600e8a6b57dd3.pdfIn PDF document text
    • https://tumunonapuve.weebly.com/uploads/1/3/1/3/131379134/5746970.pdfIn PDF document text
    • https://cdn.sqhk.co/konidadelan/g01FmNV/phoenix_movie_theaters_north_versailles.pdfIn PDF document text
    • https://cdn.sqhk.co/jesisuvov/haYSjcQ/heroes_of_land_air_and_sea_expansion.pdfIn PDF document text
    • https://cdn.sqhk.co/kodivitedi/hc0rifE/97314523230.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480895/normal_604365a90b109.pdfIn PDF document text
    • https://cdn.sqhk.co/revinoxu/cswxggs/visofererufas.pdfIn PDF document text
    • https://lewotivegil.weebly.com/uploads/1/3/4/3/134320996/2661298.pdfIn PDF document text
    • http://mulisefetijasal.iblogger.org/upsc_mains_mathematics_optional_syllabus.pdfIn PDF document text
    • https://wuvotawek.weebly.com/uploads/1/3/4/8/134872633/podepejowutanelapu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/889be099-e794-4528-8112-fdba626cf1b3/85832810035.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e749854a-1a32-4c29-b2c1-a6a3eabf1323/singer_futura_error_code_e1.pdfIn PDF document text
    • http://tidefos.epizy.com/mowaripu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22d0e35d-2e04-42e4-a477-83ddde3ad79b/how_to_turn_on_consumer_cellular_flip_phone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52054548-e790-4dc6-a0b4-8641851edbb4/faronuvigabizeju.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_off0000db07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB07 4924 bytes
SHA-256: a985919966f6ce1a36f5e43b9c2dc327c5d5f6338a5be934aa70bea593abe094
font_01_sfnt_off0000ebb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB8 10308 bytes
SHA-256: 7c1566a02020f29256e23b686c106ed0bce19696af7bc2a6bb680efe30c4f260

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