Malicious PDF — malware analysis report

Static analysis result for SHA-256 93db7ea7e4584909…

MALICIOUS

PDF

80.5 KB Created: 2021-03-06 22:04:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: f486e95660a2c7f6a0055e19620142f0 SHA-1: f8942bece9666c64724ced789bff7d2dd589e21d SHA-256: 93db7ea7e45849098a467e4a35c4d80155a0a54bb8492aff5814e9270d10c14e
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 hosting, and is flagged by ML classifiers and ClamAV as malicious phishing content. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a link farm strategy, likely to obscure the true malicious intent of the primary URL. No scripts were extracted, but the overall structure and URL distribution suggest a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://xajibur.ru/award?keyword=landforms+worksheets+in+spanish PDF link annotation
    • http://rentline.pro/attached_amir_levine_download5xd4b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417814/normal_60327d5c21bac.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383912/normal_5ff534173d239.pdfIn PDF document text
    • https://cdn.sqhk.co/gufezima/hjdhhih/archero_talents_tier_list.pdfIn PDF document text
    • http://maxoranano.sportsontheweb.net/sivupu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484380/normal_6041ecce6e216.pdfIn PDF document text
    • https://cdn.sqhk.co/wovegase/gfc3wgd/neon_road_game.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423189/normal_60245f8811fe2.pdfIn PDF document text
    • http://qrettalq.online/is_new_yorker_subscription_worth_itaqj96.pdfIn PDF document text
    • http://nekidifuton.medianewsonline.com/what_does_alpha_tango_foxtrot_mean.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba553606-d65d-42c6-9103-06c5b74fd523/what_material_is_a_stress_ball_made_out_of.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ee02dc5-59fa-4003-a71b-07b791a27644/how_do_you_calculate_cash_dividends.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bf01c9e-457e-44a1-b471-aea2428e1984/10403427632.pdfIn PDF document text
    • http://wolobugoxew.myartsonline.com/10859525320.pdfIn PDF document text
    • http://litorow.myartsonline.com/79009918497.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a180aa5-d3a1-43e7-8be2-128ff564fd6e/samsung_smart_tv_audio_out_headphones.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_off0000fe92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE92 5348 bytes
SHA-256: 3c47edb50abc24d43cae5833752447cf74710964357aad83b1baf061a88df76c
font_01_sfnt_off000110b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B4 10472 bytes
SHA-256: ec84c0369807bcd48fdcde1662500efd6d22b5f0a230ea651fed5fb1af9333b0

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