Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf4417818a8b946b…

MALICIOUS

PDF

87.6 KB Created: 2021-03-12 10:50:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: c71bf24296ec57ce49007cb46a5217b4 SHA-1: 2ec48e0dbd04bec55d557653169beab40ac61440 SHA-256: cf4417818a8b946ba85e1dc4a40b0d6db85257fa115ecc21c56d7244652de0f6
126 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is a link farm on disposable hosting, with numerous embedded URLs pointing to external sites. The presence of these links suggests an attempt to direct users to malicious content, likely for phishing or malware distribution.

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://vilenefex.ru/strik?utm_term=hornady+300+blackout+reloading+data PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4496828/normal_5ffac15367124.pdfIn PDF document text
    • http://blancop.xyz/motorola_mh230r_rechargeable_two_way_radio_4_pack1p157.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381528/normal_60172c7c7d1a9.pdfIn PDF document text
    • http://zabavnyi-slon.ru/gapiwuzereguxu5m26g.pdfIn PDF document text
    • http://newipufisatag.scienceontheweb.net/advanced_financial_accounting_11th_edition_solutions_manual.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480748/normal_600c57d048112.pdfIn PDF document text
    • http://xutefizil.getenjoyment.net/advanced_computer_architecture_textbook.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414701/normal_603ab3b8a0891.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374181/normal_601a13de63fa9.pdfIn PDF document text
    • http://beremoter.online/46466052517bvfc0.pdfIn PDF document text
    • http://characduwe.space/masons_rule_examples6a79u.pdfIn PDF document text
    • https://tebifuwufarul.weebly.com/uploads/1/3/4/8/134886387/marewefiv.pdfIn PDF document text
    • https://xevibobi.weebly.com/uploads/1/3/4/6/134683071/474e1d0.pdfIn PDF document text
    • http://nitiwomifigurod.mygamesonline.org/zikowuzet.pdfIn PDF document text
    • http://meriline.store/fepojarufitobodosuv43u0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8641c524-1fb5-4292-87ed-dd72f64d6c22.filesusr.com/ugd/9b7d8a_b3e348fb5535489c9d7328559f2daa07.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbd409c5-bdb8-4a7c-8ef6-75c10280d41b/stihl_autocut_25-2_replacement_spool.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1833fce6-8892-4ca1-bed8-578a6823b0d3/xadelepamowipulijitoj.pdfIn PDF document text
    • https://7e079b21-6cfc-4bbc-a8af-001f4930a7f2.filesusr.com/ugd/f66805_36853cab12d84468b3658ab12137b9ba.pdf?index=trueIn PDF document text
    • https://34ec465e-51aa-4dba-9a8c-c05fcfb5ae84.filesusr.com/ugd/df15ee_264e296c3d9e43fe87d484bb11b3fa01.pdf?index=trueIn PDF document text
    • https://fb4bdcd3-28a3-4206-a6c3-fb267f511c23.filesusr.com/ugd/0ad562_266f3dc24a4149df9568a18cc6928eea.pdf?index=trueIn 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_off0001179f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1179F 5500 bytes
SHA-256: 21e27e7d667f33ca29fb04e5eb34afa49102830d7848b8e2f5c4bec408171bb5
font_01_sfnt_off00012a66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A66 11112 bytes
SHA-256: b6a2b9cc4f82c16ba2378e7e1c86a5989c5f6d205dbd942013c5bc95c34c4f27

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