Malicious PDF — malware analysis report

Static analysis result for SHA-256 b70f2d028c9fe0c9…

MALICIOUS

PDF

74.0 KB Created: 2021-06-04 09:05:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 773bbd7e7b6f92da779b221239efae10 SHA-1: d2771bd0df5370ce30b128beca0b3a13bccbe052 SHA-256: b70f2d028c9fe0c9c8c260f48429d003d17b36e75daa07343004e2e2bb3d2f1c
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a high-confidence heuristic flagging it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The presence of embedded URLs suggests an attempt to redirect the user to a malicious site, potentially for credential harvesting or further payload download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://wastran.ru/pbw?utm_term=iso+9001+quality+management+system+ppt PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4379049/normal_5fc78fc1387b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444630/normal_604910a17e9c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502175/normal_60369081225ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384159/normal_6021866622013.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488139/normal_5fcfed1cd3804.pdfIn PDF document text
    • https://jibojirugaj.weebly.com/uploads/1/3/4/8/134846900/6034910.pdfIn PDF document text
    • https://ruxosirixu.weebly.com/uploads/1/3/4/3/134334364/35cbf02d99fdd.pdfIn PDF document text
    • https://wusafasugulub.weebly.com/uploads/1/3/4/5/134586051/kefoxedutusula_kajan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481275/normal_5fe8f38d2cc82.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mapijakemifo.pbworks.com/f/the_intelligent_investor_the_definitive_book.pdfIn PDF document text
    • http://noxiwako.pbworks.com/f/guia_super_mario_bros_2_nintendo_3ds.pdfIn PDF document text
    • http://vajaxasave.pbworks.com/f/96039946613.pdfIn PDF document text
    • http://kukepofarit.pbworks.com/w/file/fetch/144470373/jaxolodenomamipepe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4864cef9-c611-4d3d-86db-ceeac9fc7b8d/78705814170.pdfIn PDF document text
    • http://vibasuvezuz.pbworks.com/f/famidagon.pdfIn PDF document text
    • http://vogituvu.pbworks.com/w/file/fetch/144507762/42817296668.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c5d1c21-fbd6-4ab2-9a8a-5b03338b90fb/xavax.pdfIn PDF document text
    • http://joxakuruvi.pbworks.com/w/file/fetch/144515580/fivew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c532414-20c7-4bb6-99ce-998b238f7a9b/wububotudodinagovi.pdfIn PDF document text
    • http://pigedigasexu.pbworks.com/w/file/fetch/144510207/lepoxomewemenimu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04853292-0057-49be-8a16-01efb4b72e64/bain_what_the_best_college_teachers_do.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b00b81d-18c4-4ad4-9e59-e9b4f275d6a8/ff_xv_review.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_off0000e63e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE63E 5556 bytes
SHA-256: dece216e5c8c1527a4518f203d81795a9d8d6ce0bce3a6dc7b3ec3f8ab1e67d9
font_01_sfnt_off0000f925.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF925 9772 bytes
SHA-256: 3bfdcecd49778635eba0b84d6f6596aea62d7aedb3f1160ed05a74bc177835e2

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