Malicious PDF — malware analysis report

Static analysis result for SHA-256 266ab6708988e763…

MALICIOUS

PDF

73.7 KB Created: 2021-02-25 15:10:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: effe31956468bf1d0847801f2041ea17 SHA-1: 8e0ff55029b80ad55c5c759127d0d3d124a65b1f SHA-256: 266ab6708988e763190171b500857fcfa8387850176cccc1a68ae75ceedf59c4
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically pointing to 'baarspo.ru/strik' and containing a 'roland+spd+30+kits+free+download' query parameter, indicating a lure for free software. Heuristics indicate this PDF is a link farm on disposable hosting, and ClamAV detected it as 'Pdf.Phishing.Trojan'. The ML classifier also flagged it as malicious with high confidence.

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/strik?utm_term=roland+spd+30+kits+free+download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4476782/normal_5ffbce5d57beb.pdfIn PDF document text
    • http://pazadixokumox.sportsontheweb.net/can_students_get_adobe_for_free.pdfIn PDF document text
    • http://trycabinets.xyz/what_is_your_biggest_pet_peeve_answerc5ua0.pdfIn PDF document text
    • http://savadaqwe.space/100_years_war_duration9d7am.pdfIn PDF document text
    • https://cdn.sqhk.co/zipuzedozame/DBuje1S/75475649338.pdfIn PDF document text
    • https://cdn.sqhk.co/joxipadij/BzwgfjN/gadazebebik.pdfIn PDF document text
    • http://shtangye.xyz/69122846292baz3r.pdfIn PDF document text
    • http://zezarujewida.iblogger.org/genie_intellicode_garage_door_opener_remote_programming.pdfIn PDF document text
    • http://cccckkkkkdd.space/remington_870_express_magnum_20_gauge_trigger_assemblyp36vh.pdfIn PDF document text
    • http://ionatr.fun/15079041469bnyb1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382789/normal_5fd9baf83ab56.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390374/normal_5fcbc2f9bed26.pdfIn PDF document text
    • https://cdn.sqhk.co/bupewazadufa/jhjzFep/4924962299.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wotidupodugi.myartsonline.com/kewor.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_off0000ddf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF4 5504 bytes
SHA-256: 6d3b1730c3afe6334eaea3ff8ac67bcfc94869581322fc69c33d1d2c479bcce0
font_01_sfnt_off0000f0d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D8 11752 bytes
SHA-256: 8c4d907a8f3d54172fca7ecdf7aa056346e091f848517fd2ca5197d6903c6b60

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