Malicious PDF — malware analysis report

Static analysis result for SHA-256 c699e6ea8282bfdd…

MALICIOUS

PDF

87.4 KB Created: 2021-02-19 19:54:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: c87f2a87a43ca487475daafe072ed4c6 SHA-1: 875b43de6dc6a97669ed27267793738ce37c7e44 SHA-256: c699e6ea8282bfdd6dbffaa0f20bfb70a7fa4664a20e22866969a91d533a0e98
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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/strik?utm_term=arcane+power+classic PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4424036/normal_5fefabff49508.pdfIn PDF document text
    • http://cardioactiveuficiale.site/2008_ford_ranger_manual_transmissionznt0a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374852/normal_601621a46f10c.pdfIn PDF document text
    • https://cdn.sqhk.co/kubasovusi/ihgjZCu/nubuzonesedoxejawas.pdfIn PDF document text
    • http://ita-yog.space/bleacher_report_champions_league_replay9aacc.pdfIn PDF document text
    • http://avto-trokot.xyz/16768670275jjl1c.pdfIn PDF document text
    • http://czecheducation.space/48545375717n3r1b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454556/normal_5fc98a6eb5c73.pdfIn PDF document text
    • http://wide-take.top/compuscan_free_credit_report_south_africa1u8ov.pdfIn PDF document text
    • http://uspeh.icu/66486216822jp10w.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490252/normal_601756a2b68f6.pdfIn PDF document text
    • http://social-whisper.ru/16295720024slabw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zuvetimimu.rf.gd/journey_to_the_past_anastasia_piano_sheet.pdfIn PDF document text
    • http://zinikifog.rf.gd/surviving_sepsis_guidelines_vasopressors.pdfIn PDF document text
    • https://s3.amazonaws.com/gimufesajo/bmbs_full_form_in_railway.pdfIn PDF document text
    • https://s3.amazonaws.com/nezanurugega/ncert_class_12_physics_chapter_7.pdfIn PDF document text
    • https://s3.amazonaws.com/bajapovogam/tudute.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_off00011979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11979 5008 bytes
SHA-256: 1c3d9791c6072cf3c1e1ed01a01e80356768b0eae48b86781333b1e8918797ce
font_01_sfnt_off00012a9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A9F 11152 bytes
SHA-256: 520308fb1c1947e91ef61ed20c4519368af72a94c7fc542fd074aa3aa40289bd