Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfa9319d856f65aa…

MALICIOUS

PDF

66.0 KB Created: 2021-04-24 05:34:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 4ef60d7bfdf1ffe6e6880c9f6883b8ce SHA-1: 708e7070c9a5966bb47e2b29a7d1b1a1ae05010a SHA-256: bfa9319d856f65aa1f13f8678a2bcf98ce3c75036abe9707f70f0c81f93afa73
186 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. The presence of a critical ClamAV detection and ML classifier flagging indicates malicious intent, likely to lure users to malicious sites or download further payloads. No scripts were extracted, but the PDF structure itself is indicative of a phishing or malicious redirection scheme.

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://gimoguvi.ru/strik?utm_term=amc+8+answers PDF link annotation
    • https://cdn.sqhk.co/motuxeneb/chc6gfR/83052340183.pdfIn PDF document text
    • https://pubedazemel.weebly.com/uploads/1/3/4/8/134870130/wowaligexun-wuwabifo-kejixepema-porase.pdfIn PDF document text
    • https://boserizozililo.weebly.com/uploads/1/3/2/6/132682878/deveponamupovo.pdfIn PDF document text
    • https://cdn.sqhk.co/vitimosugu/jeq8stv/68444292329.pdfIn PDF document text
    • https://cdn.sqhk.co/gitogozune/Z2iiihF/palinorepijux.pdfIn PDF document text
    • https://cdn.sqhk.co/kogoruzojif/fibJhh0/rosuwi.pdfIn PDF document text
    • https://cdn.sqhk.co/xetasenuwoji/jIgjgj4/8942926154.pdfIn PDF document text
    • https://cdn.sqhk.co/lagolipumepi/Jovhgjb/harlem_globetrotters_basketball_ball_uk.pdfIn PDF document text
    • https://doxuginuf.weebly.com/uploads/1/3/5/3/135346615/7873766.pdfIn PDF document text
    • http://daliadiago.com/best_deal_on_beats_pro_wirelesshx3wq.pdfIn PDF document text
    • https://cdn.sqhk.co/dejuxafe/Ihga7VQ/fober.pdfIn PDF document text
    • http://24goodstore.site/how_to_solve_sony_push_power_protectorcgox2.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/lepefi/dialectical_behavior_therapy_skills_handbook.pdfIn PDF document text
    • https://s3.amazonaws.com/lanaladu/o_que_doena_falciforme.pdfIn PDF document text
    • https://99516632-72ce-40f3-a9a1-a01c91361c65.filesusr.com/ugd/e42c35_83ae86575851495daa30a8540169c9d7.pdf?index=trueIn PDF document text
    • https://18e99e0c-7034-4a8c-9069-267580a295b8.filesusr.com/ugd/b337f5_be65ee54ec2f43c9bcc786f898f0121c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nonipesikiri/91032121900.pdfIn PDF document text
    • https://97a45c9e-1ab5-462a-bfe2-fded34b9a8b9.filesusr.com/ugd/b50c55_16eab25f07f44e46a53dc3529903265e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lazesej/97245653866.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_off0000c727.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC727 5188 bytes
SHA-256: c5c866a6fbf883c0d5269244b77d17e746f5fa2e6ba91cc726ecff80cd67e552
font_01_sfnt_off0000d8c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C5 10300 bytes
SHA-256: ae93418ba5f36d4d4b6aa7d7ae025b5bf1cc64c5f335a6a8d2d860e6027ca627

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