Malicious PDF — malware analysis report

Static analysis result for SHA-256 5974944607790215…

MALICIOUS

PDF

76.6 KB Created: 2021-02-05 13:25:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 26914207849e28d8e9bf14aac1294106 SHA-1: 1c8a41f3437d68fd67b9ad89390c28849e93ca47 SHA-256: 5974944607790215772486d3787566c3eb821937f7eb405cce2cb5b9fa3f8ea0
186 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as a link farm, with a critical finding indicating a mass of external PDF links. The ML classifier and ClamAV also strongly indicated maliciousness. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDFs from web content, which aligns with the link farm behavior.

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://seumenha.ru/123?utm_term=the+memory+keeper%2527s+daughter+movie+on+netflix PDF link annotation
    • https://cdn.sqhk.co/diratukuz/SRjbajc/66510946946.pdfIn PDF document text
    • https://retedavaliloxi.weebly.com/uploads/1/3/5/3/135393755/6321040.pdfIn PDF document text
    • https://risogaruwakev.weebly.com/uploads/1/3/4/6/134634919/15a361deadc3.pdfIn PDF document text
    • https://funefazadoma.weebly.com/uploads/1/3/4/6/134648765/2264434.pdfIn PDF document text
    • http://gprofights.ru/game_theory_applications_in_real_life9rf9t.pdfIn PDF document text
    • https://wosobariwosamu.weebly.com/uploads/1/3/4/3/134372044/2925174.pdfIn PDF document text
    • https://cdn.sqhk.co/bitizulokiva/Ghgghhh/club_factory_online_shopping_app_review.pdfIn PDF document text
    • http://xavelodezazil.iblogger.org/finurilewifar.pdfIn PDF document text
    • http://copyright-securityx.com/koketed9fmmc.pdfIn PDF document text
    • https://cdn.sqhk.co/fedovipawe/yKSggTn/wakinevubiwux.pdfIn PDF document text
    • https://cdn.sqhk.co/xarozowuzosa/bX0kgdD/dragon_ball_z_dokkan_battle_apk_mod_jp.pdfIn PDF document text
    • https://romugazasemagop.weebly.com/uploads/1/3/4/8/134897733/fizixakezenuta.pdfIn PDF document text
    • https://nudadisaxoge.weebly.com/uploads/1/3/4/0/134018155/1781063.pdfIn PDF document text
    • https://fuvobavan.weebly.com/uploads/1/3/1/6/131637325/3542042.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/gezejoputiwinu/pizazemiwurolobumobekigo.pdfIn PDF document text
    • http://jasukapikubov.rf.gd/buku_akuntansi_keuangan_kelas_12.pdfIn PDF document text
    • http://vusukunuvedigup.epizy.com/fate_grand_order_summer_event_2018_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/takurugilij/gimalobesu.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_off0000ed5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5C 5732 bytes
SHA-256: cf691c62c46f82c3f4de0e898bd6755c4976e8c199ba5a1bfc212e41a9d050a2
font_01_sfnt_off000100cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100CD 10620 bytes
SHA-256: e9c6ca4a3ec8aa6e2c5b8018f049829da890e2b4829951b484dd52c5d4f92aed

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