Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9febbf6fe6ff585…

MALICIOUS

PDF

77.9 KB Created: 2021-02-22 05:04:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 10c36988d8133a6c2e65cad22eeeb87f SHA-1: 32d9c46116294bcedac20c56083d950609ceb529 SHA-256: b9febbf6fe6ff585ba161cf98abc15f6868e6fc503d765003e4e31821e57aab6
126 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, including external URI redirection and a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest this is a phishing or malware distribution document. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect the user to malicious content, likely for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://druttle.ru/strik?utm_term=how+to+use+hoover+floormate+spinscrub PDF link annotation
    • http://help-ruleviolation.com/11834085288qc71n.pdfIn PDF document text
    • http://babbieshop.ru/photoshop_brochure_templates_freepdx5m.pdfIn PDF document text
    • http://fonareru.22web.org/4684210466.pdfIn PDF document text
    • http://normab-id.com/mabebuvotewuwitimvbc3.pdfIn PDF document text
    • http://zoosalon.org/14997538052j8p0o.pdfIn PDF document text
    • http://karaulovlife.site/navalumenxsgi.pdfIn PDF document text
    • http://storeeu.info/torubekaniti3t7rj.pdfIn PDF document text
    • http://dommasters.site/276113541124p0lf.pdfIn PDF document text
    • http://thedefenseforge.com/too_busy_not_to_pray_free0t8t4.pdfIn PDF document text
    • http://poverkavoda.website/bangkok_university_uniformtxjtl.pdfIn PDF document text
    • http://curvepreloved.com/best_voice_changer_software_for_pc0ncwq.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/padosumifubobo/king_size_platform_bed_frame_without_headboard.pdfIn PDF document text
    • https://s3.amazonaws.com/zatazewoz/toligadabirulekazad.pdfIn PDF document text
    • https://s3.amazonaws.com/sitok/bd_live_tv_apk.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_off0000f2d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D1 5508 bytes
SHA-256: fcd1761bb92330aac7d0ec2169d1c2b7ed68da2c84524c3284d2f141ca8dec7d
font_01_sfnt_off00010574.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10574 11080 bytes
SHA-256: cf0f17ed3e92c5e14d75dd4197d5d7f1b77f0ada6f66fe3f874a6964ae2bdd74

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