Malicious PDF — malware analysis report

Static analysis result for SHA-256 831d9c285b746740…

MALICIOUS

PDF

54.6 KB Created: 2021-02-25 16:55:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 72b3f7c763fdb0c0129f957de2bd9ace SHA-1: bb3bc55567fefe3c3efdeb1295f4ce59719a6c57 SHA-256: 831d9c285b746740b9170105bea2a742c4874dca566387c42f9ea7b65a5994f1
124 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple external links, with one specifically identified as a link farm on disposable hosting, suggesting a malicious intent to redirect users. The ML classifier and ClamAV detection strongly indicate malicious content. While no scripts were extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9152

Heuristics 4

  • 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
  • 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://crophysi.ru/aws?utm_term=easy+stone+soup+recipe+for+classroom PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4461207/normal_5fe8def91d5cf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500438/normal_60012ca173fe6.pdfIn PDF document text
    • http://tokigarodam.22web.org/redokuzemesuladafula.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470040/normal_5ff49bcdab754.pdfIn PDF document text
    • https://cdn.sqhk.co/mojuzizimu/iTif0VC/winky_lux_rainbow_lip_balm_target.pdfIn PDF document text
    • https://cdn.sqhk.co/rijomawonuj/hejgep0/rummikub_board_game_rules.pdfIn PDF document text
    • https://cdn.sqhk.co/gojogefe/dgjjcjc/26489905787.pdfIn PDF document text
    • https://cdn.sqhk.co/ridijafugemi/LieieOG/giwewekotu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380876/normal_5fd1b986ca356.pdfIn PDF document text
    • https://cdn.sqhk.co/lenufetimop/igsib3d/49589527915.pdfIn PDF document text
    • http://gazariruv.iblogger.org/rawaxe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405654/normal_603304f90096e.pdfIn PDF document text
    • https://cdn.sqhk.co/kefekawit/jRifizm/xikewixidumijodot.pdfIn PDF document text
    • https://cdn.sqhk.co/tabuguran/VFMHMgh/neighbors_2_full_movie_watch.pdfIn PDF document text
    • http://lomuwobutuwadim.rf.gd/gospel_choreography_videos.pdfIn PDF document text
    • http://putetudufotu.rf.gd/browser_app_for_iphone.pdfIn PDF document text
    • http://nowesiredud.epizy.com/bartender_old_version.pdfIn PDF document text
    • http://xesogopobatobop.epizy.com/black_panther_movie_wallpaper.pdfIn PDF document text
    • http://masegopadi.epizy.com/46521950033.pdfIn PDF document text
    • http://nifagusimesizi.epizy.com/feasibility_study_template_doc.pdfIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

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