Malicious PDF — malware analysis report

Static analysis result for SHA-256 739782735eebf35d…

MALICIOUS

PDF

123.7 KB Created: 2021-03-03 19:29:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: d485c7bcedfc79944f575ebe581d3bb9 SHA-1: 70b534d7ad9d950d76db6aa17ab6c5337a75e11a SHA-256: 739782735eebf35da67bc0fe24b13dc2fbabf5374e7ca817ec19d70b54843dba
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The document body, though heavily obfuscated, contains keywords related to movie downloads, aligning with a lure to illicit content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/award?keyword=fight+club+consumerism+movie+download+in+tamilrockers PDF link annotation
    • http://afracheat1.xyz/completing_the_square_using_algebra_tiles_videoulhjj.pdfIn PDF document text
    • https://gelujesu.weebly.com/uploads/1/3/4/8/134847850/00a3c0.pdfIn PDF document text
    • http://prostotit.site/livutuzujazidi4zgkh.pdfIn PDF document text
    • http://bivitajuteje.mypressonline.com/34519856536.pdfIn PDF document text
    • http://hookup153.site/tapubasiwebamomubifaka7.pdfIn PDF document text
    • http://lelekelosutov.getenjoyment.net/kotijaretovuvo.pdfIn PDF document text
    • https://cdn.sqhk.co/firumefetev/gcbidwt/74462318269.pdfIn PDF document text
    • http://trudogoliya.online/ear_infection_drops_medicinex7o7v.pdfIn PDF document text
    • https://cdn.sqhk.co/moxelutedoje/hgH1Yji/neon_red_wallpaper_tumblr.pdfIn PDF document text
    • http://photoforce.ru/bose_qc_35_i_manualu66ib.pdfIn PDF document text
    • http://ig-soft-team.com/java_coding_interview_questions_and_answerszpbwn.pdfIn PDF document text
    • http://tuwasukam.getenjoyment.net/62820674139.pdfIn PDF document text
    • https://cdn.sqhk.co/detazido/hVighgc/66014156740.pdfIn PDF document text
    • https://bovaromekefa.weebly.com/uploads/1/3/4/4/134403346/vamodirew-dujetilofopol.pdfIn PDF document text
    • http://bluebadgeform.com/26036038547oqmuf.pdfIn PDF document text
    • http://pobesegu.scienceontheweb.net/how_to_reset_kenmore_washer_machine.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rofuvawitarul.atwebpages.com/dark_souls_3_save_game_editor_pc.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_off0001a83d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A83D 5664 bytes
SHA-256: f8524c418053412df1df16041dc2fbc707b67be6f707a2ca055d8ca28812d913
font_01_sfnt_off0001bb6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BB6C 10868 bytes
SHA-256: 8f3ee777984ff46e95429905032e227abc1edf38df0a6fa2158e53741c8f4442

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