Malicious PDF — malware analysis report

Static analysis result for SHA-256 a40a13004e0695cc…

MALICIOUS

PDF

80.5 KB Created: 2021-05-09 10:40:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 7347bc404480ee77d344c417a39b70d5 SHA-1: 692bc257cc6b035fcfe8610be4093297007b0367 SHA-256: a40a13004e0695cc17a145f25856fa6e2a542e145a4d7bbfd3432ca94ad7267d
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or scamming operations. No scripts were extracted, but the primary attack pattern involves luring users to external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://pelibifir.ru/strik?utm_term=learn+ruby+the+hard+way+html PDF link annotation
    • http://prodson.space/31448422421btdlt.pdfIn PDF document text
    • https://cdn.sqhk.co/titabofasika/huhgMgf/48691276233.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367013/normal_6046f936ec7d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389792/normal_600da4444c510.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380223/normal_5ff3094c9fb71.pdfIn PDF document text
    • http://usacarins.com/457997840113kc8q.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473359/normal_604cc98b5f164.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494681/normal_60454f6ac9b7c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450730/normal_606e131018266.pdfIn PDF document text
    • https://cdn.sqhk.co/jewipabefoji/hbKriRf/skateboard_party_3_pro_apk.pdfIn PDF document text
    • https://poxovoxi.weebly.com/uploads/1/3/5/3/135398301/wetinusukagox.pdfIn PDF document text
    • https://cdn.sqhk.co/pibilebomek/jbjdibm/nail_designs_ideas_to_do_at_home.pdfIn PDF document text
    • https://cdn.sqhk.co/vefoxewijuja/s8hajen/41647301642.pdfIn PDF document text
    • http://lnstagramcopyrigtservice.com/penny_stocks_for_dummies_cheat_sheetpfoeb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415745/normal_601b27a347cae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381964/normal_604d491516c17.pdfIn PDF document text
    • https://litaxavuve.weebly.com/uploads/1/3/4/8/134848922/d046e0.pdfIn PDF document text
    • https://mumovukejepi.weebly.com/uploads/1/3/1/4/131483147/a0f582ee161a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460471/normal_605798649bd88.pdfIn PDF document text
    • https://xurebutira.weebly.com/uploads/1/3/2/6/132681359/c41a5e5a3a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459062/normal_60694d78f4028.pdfIn PDF document text
    • http://podeves.xyz/mopofirepuqn190.pdfIn PDF document text
    • https://cdn.sqhk.co/satofurijob/dJqBiir/47102566238.pdfIn PDF document text
    • https://sakotitalivuvu.weebly.com/uploads/1/3/4/8/134887700/7498723.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403946/normal_6059afb1e808c.pdfIn PDF document text
    • http://argo-tourism.com/rizuwemidatam3w.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475588/normal_60050683b4e0c.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_off0000f8a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A7 5160 bytes
SHA-256: e5f43ba221000e7e31aa6380917a9abbbeb5aae0bbf7f58df0d0547f443ed946
font_01_sfnt_off00010a20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A20 12312 bytes
SHA-256: edb3a2f9d509b5de5a372744a513cdfc7e508fecebfb0a2e8980e65f99437824