Malicious PDF — malware analysis report

Static analysis result for SHA-256 059a87be3d4dd124…

MALICIOUS

PDF

73.0 KB Created: 2021-02-07 15:30:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: ce2b818a77fc68defe97a49d24c37701 SHA-1: b3c53884be0e21106259b137e28889d96aa05349 SHA-256: 059a87be3d4dd124ba1624b62b7839f337d44719138ec9b3d22829f51d775397
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a machine learning classifier and ClamAV, indicating it is likely a phishing or malware distribution lure. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggest the document's primary purpose is to redirect users to potentially harmful websites. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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://leonvi.ru/123?utm_term=massachusetts+state+flower PDF link annotation
    • https://cdn.sqhk.co/temirikuji/fbjahfR/28269944325.pdfIn PDF document text
    • https://cdn.sqhk.co/wemorapi/L5sphh3/basketball_hoop_near_me_walmart.pdfIn PDF document text
    • https://cdn.sqhk.co/nawakema/eiihjhg/ludovico_einaudi_divenire_sheet_music.pdfIn PDF document text
    • http://mists.space/tozila5zc7t.pdfIn PDF document text
    • https://cdn.sqhk.co/nedupugifuka/7vFougi/derwent_academy_watercolor_pan_set_review.pdfIn PDF document text
    • https://cdn.sqhk.co/fekigimuzib/hig5jc4/vezonoduk.pdfIn PDF document text
    • https://cdn.sqhk.co/rejibebadit/W2jfPKh/goniriretopegomeve.pdfIn PDF document text
    • http://stebsmeh.space/the_whipping_boy_en_espanolrekym.pdfIn PDF document text
    • https://cdn.sqhk.co/vulovosovem/ifdwZEi/rabbids_crazy_rush_game.pdfIn PDF document text
    • https://cdn.sqhk.co/mofijovelu/rghWigg/sling_puck_amazon_canada.pdfIn PDF document text
    • http://fortuneocredit.com/criteria_cognitive_aptitude_test9phow.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nogurinuzelajer.rf.gd/29678853082.pdfIn PDF document text
    • http://fizoluzakazuxaw.rf.gd/lerolonel.pdfIn PDF document text
    • http://gegukisakewomo.rf.gd/developer_options_android_7.pdfIn PDF document text
    • https://s3.amazonaws.com/golepe/siwasuvewuwumonanalunuxi.pdfIn PDF document text
    • http://fivamoxopel.epizy.com/nigubavuwosaruwapinubetid.pdfIn PDF document text
    • http://difugarulid.epizy.com/bodybuilding_training_guide.pdfIn PDF document text
    • http://kizuwopo.epizy.com/speaker_knockerz_album.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_off0000e0c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C3 5068 bytes
SHA-256: af35f067a6a38d2bc9b157ee040cffc2ddd4a28bbd5c6cbb974d5e7eda8fe2da
font_01_sfnt_off0000f218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF218 10796 bytes
SHA-256: 7a831a020657a28c4cea9a1b719d1a74c91f0cc921d50656c35018962a63a075

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