Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dc5e4847cbc597d…

MALICIOUS

PDF

68.0 KB Created: 2021-03-05 16:27:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 2c06e3589b617aeed05273faa9b3c871 SHA-1: 9db2e038347d7f6d0457b983ebae0bc18bec4bf1 SHA-256: 9dc5e4847cbc597d9fdb62d0f29d6d104b7c97145c4743261c42cce2aa84cc76
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified as a link farm, with several pointing to unknown or potentially malicious domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content.

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://mezovuduw.ru/wb?keyword=bissell%20powerforce%20helix%20parts%20model%201700 PDF link annotation
    • https://cdn.sqhk.co/fabokofe/hchjMgi/boost_buddies_discord.pdfIn PDF document text
    • https://cdn.sqhk.co/gusiloxi/hiwOSGy/90881277152.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386095/normal_602769535bc20.pdfIn PDF document text
    • http://noksipals.online/amritsar_city_mapua5v2.pdfIn PDF document text
    • http://craftsmansmetics.com/call_block_app_for_android_freealsn3.pdfIn PDF document text
    • https://cdn.sqhk.co/lupekute/dhjagdV/julemapotovowivu.pdfIn PDF document text
    • http://fepegabilufe.iblogger.org/capacryl_pu_satin.pdfIn PDF document text
    • http://fajamad.mypressonline.com/xafunububevi.pdfIn PDF document text
    • https://cdn.sqhk.co/powirafawume/hXj5Ajh/green_pan_reviews.pdfIn PDF document text
    • https://cdn.sqhk.co/lamajemomu/ON6thaO/bujifivezijupo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488116/normal_601f320c177fa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xakagigoneliv.myartsonline.com/relion_prime_test_strips_instructions.pdfIn PDF document text
    • https://123949be-7110-4ba3-a240-a7df06fb38ce.filesusr.com/ugd/80fd5d_c6660b6795764f159ed48e28555d0985.pdf?index=trueIn PDF document text
    • http://fodarevo.rf.gd/hungry_shark_evolution_mod_apk_hack_ios.pdfIn PDF document text
    • http://mudefikireneb.rf.gd/nafafuxowinorifolavado.pdfIn PDF document text
    • http://kojuvurapamox.myartsonline.com/how_to_write_citations_in_apa.pdfIn PDF document text
    • https://43cb2d18-1589-43a7-b1c5-fe1278e1c76d.filesusr.com/ugd/370b54_14bc3333945846e9b3756587e31380ea.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_off0000cb21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB21 5876 bytes
SHA-256: 31e6c249566fc9bca3c70c7ea4d90a41d5cec6614d72dbf7622fb42613cf86db
font_01_sfnt_off0000df1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1C 10292 bytes
SHA-256: 2140a1d3989d76b0e1acabc348c1a8f1d0c15d608cda10333e80ea5930ddd28f

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