Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bf1f3a9706a97fd…

MALICIOUS

PDF

71.6 KB Created: 2021-05-10 22:26:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: b4109b7f422d2dff04684fea0207b1ee SHA-1: e2a322150c2bb0685d4f70478c5f9515c9be6fc3 SHA-256: 2bf1f3a9706a97fdae3ed94ca7de4e920a8483f53a5f094fbaecceba56320ce6
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to PDF files with SEO-like titles, suggesting a link farm or content-laundering operation. One of the primary external URIs, 'https://vilenefex.ru/strik', is likely a landing page for a phishing or malware campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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 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.
  • 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=conversion+ft3%252Flbm+to+m3%252Fkg PDF link annotation
    • http://lnstagram-office.com/manuel_castells_communication_power5xxfx.pdfIn PDF document text
    • https://cdn.sqhk.co/tororukiwuri/IhfPrzS/bezidorimobetojinamaki.pdfIn PDF document text
    • http://flowerport.store/mechanical_engineering_technology_purduejcc7l.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454694/normal_6025c09b22d27.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371509/normal_603c7d2e249d7.pdfIn PDF document text
    • https://cdn.sqhk.co/torazanopuni/53NLmgh/linear_momentum_questions_and_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/wifopuzuxiba/Y5ighfQ/call_of_mini_zombies_2_mod_apk.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/kagedatabujo/97075842285.pdfIn PDF document text
    • https://s3.amazonaws.com/vuzufexarevima/small_rotate.pdfIn PDF document text
    • https://s3.amazonaws.com/zalomi/84491228888.pdfIn PDF document text
    • https://s3.amazonaws.com/tasufagijaremo/votoweweruzules.pdfIn PDF document text
    • https://1347de4c-4e54-429a-b84c-372e60bc5a2b.filesusr.com/ugd/6c98bc_dde6e50021504ab5a3422ac83751dc5d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xipavir/18333707774.pdfIn PDF document text
    • https://76c9fb28-c10e-4950-85be-37de24a2ede8.filesusr.com/ugd/fa32a6_4e679917fdd04ad9bf976b547f6ad401.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xeroguru/physics_ncert_solutions_class_9_chapter_work_and_energy.pdfIn PDF document text
    • https://s3.amazonaws.com/minaxigevani/51931857559.pdfIn PDF document text
    • https://30b7a97f-6117-4fff-8876-4b3c2220b6c6.filesusr.com/ugd/15cd4d_0a5c8a5a44e5401ca4a6e8ae79c5789e.pdf?index=trueIn PDF document text
    • https://4e4301d6-cc9a-4939-960a-6b497c1efea6.filesusr.com/ugd/d78803_8f3cfa33fb6044cd93516150e3c78e52.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_off0000d9f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F4 5248 bytes
SHA-256: afddc21611de0ae41514cb7d58c1dd191e79a638c4df676108bb48e7a8b559b6
font_01_sfnt_off0000ebce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCE 10968 bytes
SHA-256: 47df42d81d3486489b00adc1f90fdcc2fa4b98863a1619b3536e77a65971f385

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