Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a0b943e4aa0bfcd…

MALICIOUS

PDF

86.5 KB Created: 2021-03-03 03:08:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: b9a495972bce277cc539f1672381cf92 SHA-1: 4272deb047be004bb573832be3d6bcfc674ab887 SHA-256: 4a0b943e4aa0bfcd475169f9d803ee34c2d60ba43e59e5e255d319484b687330
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically pointing to 'baarspo.ru' and disguised as a service manual. Heuristics indicate this PDF is part of a link farm hosted on disposable domains, and ClamAV detected it as a phishing trojan. The presence of external URIs and the ML classifier's high confidence score strongly suggest malicious intent.

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://baarspo.ru/award?keyword=toro+ccr+2000+service+manual PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4404745/normal_5ff1d59622e29.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379851/normal_603ed30aa12ba.pdfIn PDF document text
    • https://cdn.sqhk.co/navimoxa/heqChhv/checklist_template_printable.pdfIn PDF document text
    • https://cdn.sqhk.co/tibakekavero/Rpgj1hb/9282260169.pdfIn PDF document text
    • http://flymoney.net/what_is_the_difference_between_summary_and_analysisaurtc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481828/normal_5fcaa77183f7a.pdfIn PDF document text
    • http://kengoru.space/battle_islands_commanders_best_unitsdb0r2.pdfIn PDF document text
    • https://cdn.sqhk.co/xafeperale/uidivgh/townsmen_a_kingdom_rebuilt_cheats.pdfIn PDF document text
    • http://siwupojotuj.getenjoyment.net/39560255300.pdfIn PDF document text
    • http://zukoretevir.medianewsonline.com/kapasabejani.pdfIn PDF document text
    • http://vubitim.sportsontheweb.net/wordpress_login_page_address.pdfIn PDF document text
    • https://cdn.sqhk.co/zowolanazew/NZjjWie/pawn_stars_game_cheats_iphone.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://forezepolutaju.onlinewebshop.net/19644545860.pdfIn PDF document text
    • http://palelezugob.onlinewebshop.net/str_dn1040_sony.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_off000115af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115AF 5228 bytes
SHA-256: 7e24336e6ff9611211c86eb9905a6b10f12374b1cfa7e7639ebe0291bd698315
font_01_sfnt_off00012767.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12767 10964 bytes
SHA-256: e8b3c839c2b1287f522f2fd470e668d0421f6cae58a4288e976d4b15f1b8950f

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