Malicious PDF — malware analysis report

Static analysis result for SHA-256 4615f99b6b2e2930…

MALICIOUS

PDF

64.1 KB Created: 2021-02-16 05:08:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: b669bd4d75ca54714df8f3bd4fe7894c SHA-1: 819fe1e58e1f008d41ebce250d33c007f15d98c6 SHA-256: 4615f99b6b2e2930d4679376b0ed7803edd77a409b330a0d1b670040e815bb93
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external domains, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by indicating the PDF is a link farm on disposable hosting, designed to redirect users to various sites.

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://maypoin.ru/strik?utm_term=rival+electric+food+slicer+replacement+blade PDF link annotation
    • https://cdn.sqhk.co/wujakegu/jaNibi9/wallpapers_for_phone_full_hd.pdfIn PDF document text
    • http://ligazilafibab.22web.org/cavendish_university_fees.pdfIn PDF document text
    • https://kajagopop.weebly.com/uploads/1/3/4/7/134729443/vixevagilosexog.pdfIn PDF document text
    • https://cdn.sqhk.co/nobutowug/ghtGhfO/turbo_dismount_on_y8.pdfIn PDF document text
    • https://xajakubadom.weebly.com/uploads/1/3/0/8/130874473/994e3f03f6c73b.pdfIn PDF document text
    • http://particulieres-societegenerale.best/resource_bundle_android_examplegq8t7.pdfIn PDF document text
    • https://tukuboxux.weebly.com/uploads/1/3/4/5/134510407/6961375.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409103/normal_6002441c9a6fc.pdfIn PDF document text
    • https://cdn.sqhk.co/xojelumegasi/6idggfQ/75853869823.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488130/normal_600eb00c9f01a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376611/normal_60260b2152061.pdfIn PDF document text
    • http://martans.space/id_card_templates_free9nqhu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374359/normal_601b6dccb2374.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475719/normal_6016462bedc96.pdfIn PDF document text
    • https://cdn.sqhk.co/nuxoporerom/dZEuNid/44961307785.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485445/normal_5ff2cd35e3425.pdfIn PDF document text
    • http://e-devletturkiyeaidatsistemimgovtr.com/pocket_door_frame_kit_home_depot47rvh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393209/normal_5fd9b7f3794ab.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000bc30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC30 5508 bytes
SHA-256: 4d03967ccbcf5bd83b3e17b7e12ef0a9a4c88398cab243b5fd07559d3f6e545d
font_01_sfnt_off0000cedd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEDD 10160 bytes
SHA-256: 81f66bef167f3fa328e6aac8709597cb6b0fc623c7a6bfb386f18b137d662db8

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