Malicious PDF — malware analysis report

Static analysis result for SHA-256 be0f9e4a57220ca4…

MALICIOUS

PDF

79.7 KB Created: 2021-03-23 23:58:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 08a595b5353c26b0b0272cc07b906b77 SHA-1: ec466853641628518a0dd822a7a5c771a8a13064 SHA-256: be0f9e4a57220ca4006a03f827c92c272041d6312f47b7d8ad61cbdaf536aad5
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic firings suggest it functions as a link farm, attempting to direct users to external URLs, one of which is associated with a potential phishing lure for Avast Internet Security. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/123?utm_term=avast+internet+security+2018+free
    • https://cdn.sqhk.co/jarogofef/jiidGid/51855637550.pdf
    • https://cdn.sqhk.co/tuxarulenogu/gNMygf0/bazooka_boy_level_167.pdf
    • https://cdn.sqhk.co/xudekutof/jihgehf/30386163524.pdf
    • https://disinuxokisukoz.weebly.com/uploads/1/3/4/6/134610262/vagusoteleb-makewonul-xinazupufo.pdf
    • https://cdn.sqhk.co/bezakebijuk/fibhgTe/stunt_car_3d_unblocked.pdf
    • https://cdn.sqhk.co/butituguxur/io5jh2s/warivadefawuzabirixa.pdf
    • http://xojuxelase.medianewsonline.com/modal_verb_conversation_listening.pdf
    • https://lupojevoken.weebly.com/uploads/1/3/4/4/134468235/5fabe151.pdf
    • https://cdn.sqhk.co/momogajopi/9ZLsfhj/94306144091.pdf
    • https://cdn.sqhk.co/mutuwatu/jWug7XH/anamika_academy_jaher_vahivat.pdf
    • http://megidexabaror.mywebcommunity.org/91453477697.pdf
    • https://cdn.sqhk.co/tamurikubol/hVzvjgO/collage_maker_online_free_birthday.pdf
    • http://lelekelosutov.getenjoyment.net/16103957539.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://627f215e-41ba-4aa4-9906-5f9f9d117739.filesusr.com/ugd/8ab72e_a4639d6bd109466da31f2bc2911397f8.pdf?index=true
    • https://810dce77-56ab-4324-823a-3549757f4eab.filesusr.com/ugd/1fad07_e86693fb8c1a419e94eaba0103b44740.pdf?index=true
    • https://42190e62-4dca-482d-a077-ae7b222d7779.filesusr.com/ugd/b91392_101b4654e7e04d66b0cb0ff28a1acf38.pdf?index=true
    • https://1b3fde16-7575-45ba-b40e-8916c64185ca.filesusr.com/ugd/8874e8_1fa97f910ca042ffaaca01bda4b331f9.pdf?index=true
    • https://7a3463bf-3117-47cc-940f-ad9d50d05675.filesusr.com/ugd/9f2514_cc61bada7ad8465cbbf05ea23f9ffe3e.pdf?index=true
    • https://6196a4e6-b3b5-4a85-a139-4ec84e0a53d9.filesusr.com/ugd/d01287_f733323da93e4e3393e780c1dd8bf969.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb47.bin
596d16cc92f012f71c084ac3e1d9ed8d8e801a68dacc17da58882d226fd7770c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB47 5512 bytes
font_01_sfnt_off00010e26.bin
55b99a919bde3dab636036a0927bfbae5fd03faf7c3847c72d6894e9ae58dc08		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E26 10380 bytes

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