Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad6d6487ba712f36…

MALICIOUS

PDF

92.1 KB Created: 2021-03-14 07:21:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 49887a1db68d488f3c5f908dc62ff801 SHA-1: 5e44569b333b20b9484a110e99d13a192f470ffd SHA-256: ad6d6487ba712f36238d624690fe1c117ad870f0bfc249c0ff6ed7afc5f197eb
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to disposable domains and are SEO-themed. This suggests a link farm or SEO poisoning attack. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the PDF structure itself is indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://nipisod.ru/award?keyword=uk+map+with+cities+pdf PDF link annotation
    • http://septiki-rf.website/tiny_rails_combine_carsob7h2.pdfIn PDF document text
    • http://mazers.fun/huskee_lawn_mower_parts_near_mek4mr1.pdfIn PDF document text
    • https://cdn.sqhk.co/komifugu/rjficJA/scary_clown_horror_game_adventure.pdfIn PDF document text
    • https://cdn.sqhk.co/tujarazimok/eTnhjo0/bezomuneta.pdfIn PDF document text
    • http://price-list.moscow/13688591821fb9fp.pdfIn PDF document text
    • http://jirafka.space/86093710428515xe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/346f295b-d4d2-4d16-b492-7d942552e72a/free_printable_disney_cars_2_coloring_pages.pdfIn PDF document text
    • https://1c019786-7048-4615-837a-ae53f087c4ae.filesusr.com/ugd/8b4172_8f28354520544cada8fd09bb2fd8ac63.pdf?index=trueIn PDF document text
    • https://1a441fb4-51dd-4528-a053-eb59ff664e18.filesusr.com/ugd/43d9d5_f807373e867341a69b5529d2c0dcc351.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d40c82f0-9115-4ea7-91b4-21e90a8771a4/xezevubefapiv.pdfIn PDF document text
    • https://94226b1b-8363-4ad6-a779-e61b7b16ff5b.filesusr.com/ugd/b3bc21_970d133737a347c1a8dc75e1096f7b2d.pdf?index=trueIn PDF document text
    • https://abee6ad4-cf47-459a-954e-22b9b9bb30ad.filesusr.com/ugd/4bdc6d_e0bacb22062f45dfa59a42d1e40c26ec.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/de7016f6-8cd2-4d9c-9302-0f96285de286/6874717629.pdfIn PDF document text
    • https://01dc7cc6-b8ed-446e-8cc8-1ad78882ed38.filesusr.com/ugd/e23fbb_0997f206fbec4c7c9b4c058c5dedef9f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c3d4dcc-ae7d-4e0e-a0d0-def3800d34e9/nulirawonimonokuk.pdfIn PDF document text
    • https://22e365c6-0853-42e1-82f8-83473bf9c0bf.filesusr.com/ugd/217d68_1a07491a26e3499fbc88b38cf13cae32.pdf?index=trueIn PDF document text
    • https://dae57379-2785-4108-a223-4562ecbfc22e.filesusr.com/ugd/87ad98_11f454eabe2f44fa8e046d77f551bb5b.pdf?index=trueIn PDF document text
    • https://edb7bb8d-792a-4213-93ec-7f573d37cc74.filesusr.com/ugd/bfd504_30d3dd5c1d08432988f05ea785fca486.pdf?index=trueIn 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_off000128f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128F7 5416 bytes
SHA-256: e64e9336887dd765a86837dcb1d1f1da819d33a4c817e2e98b794ccb2b39b981
font_01_sfnt_off00013b58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B58 12372 bytes
SHA-256: e088be6a10dcf27371e9ad96502677e69e65610e3cdb636637488a57286a0fe1