Malicious PDF — malware analysis report

Static analysis result for SHA-256 2857620198d129bb…

MALICIOUS

PDF

71.7 KB Created: 2021-03-04 20:10:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: d63930a49e00adfb6b8dbeb9d5633092 SHA-1: ad7c9a277a591a235b7a89680185773ec6a7ed5b SHA-256: 2857620198d129bb2e4b094438a185403a6fcf2a1b5c4754c4d55598dc6c1736
244 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to disposable domains and redirectors, indicating a link farm designed to lure users to malicious sites. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' strongly suggest this intent. The ClamAV detection and ML classifier further support its malicious nature, likely for phishing or malware distribution.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=digirack+002+driver In PDF document text
    • https://cdn.sqhk.co/dokukavifig/PicGXf6/aldi_take_and_bake_italian_bread.pdfIn PDF document text
    • https://cdn.sqhk.co/jinubodilev/iqiagdD/jurassic_world_miniature_game.pdfIn PDF document text
    • https://cdn.sqhk.co/lilomovetum/gjuqA4T/2012600937.pdfIn PDF document text
    • https://cdn.sqhk.co/defisepeniba/4vieyhj/66319178297.pdfIn PDF document text
    • https://lipowife.weebly.com/uploads/1/3/2/7/132740586/84debe29e0.pdfIn PDF document text
    • http://zegererevez.medianewsonline.com/dikibajaxekizupo.pdfIn PDF document text
    • https://cdn.sqhk.co/bupusudiva/jehdlhd/steven_universe_amino_brushes_photoshop.pdfIn PDF document text
    • https://cdn.sqhk.co/kekelivig/jfjdgha/zaxinisatozigavajifapo.pdfIn PDF document text
    • https://cdn.sqhk.co/jafetegupam/cJ4ZhdT/sound_notification_tone_download.pdfIn PDF document text
    • https://cdn.sqhk.co/rorazelesu/ibCgiIw/46082771400.pdfIn PDF document text
    • http://xuxetosufuzo.getenjoyment.net/24_month_milestones_ontario.pdfIn PDF document text
    • https://depatimuxuzox.weebly.com/uploads/1/3/4/4/134404048/1975571.pdfIn PDF document text
    • https://tedotedonux.weebly.com/uploads/1/3/0/7/130775879/5084519.pdfIn PDF document text
    • https://tazuromanuzowo.weebly.com/uploads/1/3/1/6/131636862/jalawegozemavibar.pdfIn PDF document text
    • https://cdn.sqhk.co/wemitupu/jibgiji/75599699555.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vunonam.atwebpages.com/gamawobopikofafetafeju.pdfIn PDF document text
    • https://s3.amazonaws.com/zidenigad/mubuparis.pdfIn PDF document text
    • https://s3.amazonaws.com/wetowuzuxit/sms_caller_id_faker_android.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_off0000daa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA9 5292 bytes
SHA-256: dc250b94578296754c5bd70a8f2bfc7c316edb63f6e13726dafb7941d8b1ae71
font_01_sfnt_off0000eccd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECCD 11288 bytes
SHA-256: 67a226a5f3f9e0461fb0ad9abc203d054f3406a52c2ea37a6363b91414dbeecd

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