Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4b6c3bcde21c76c…

MALICIOUS

PDF

79.4 KB Created: 2021-03-01 04:57:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: c623c509c76c1d58d75ab6b1c23d1086 SHA-1: ae90d337719270447db0563bcbed618f8961128b SHA-256: d4b6c3bcde21c76c4de6e3f4bfed0ee1c2e3a9d0e76d31dcd1a46b5bc830b069
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as Pdf.Phishing.Trojan. The embedded URLs and the document's structure point towards an attempt to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

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://ponafet.ru/strik?utm_term=how+do+i+fix+the+volume+on+my+spectrum+remote PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4445888/normal_5fe02f5ab66f2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491450/normal_5fe1f64b6bff2.pdfIn PDF document text
    • https://cdn.sqhk.co/mewivupa/UdfJhg4/xojesiwonajixubimu.pdfIn PDF document text
    • https://cdn.sqhk.co/sabiwizi/jaghjh9/who_won_world_war_2_axis_or_allies.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378619/normal_602709271a2e3.pdfIn PDF document text
    • http://likujodofefa.22web.org/claudinho_e_buchecha.pdfIn PDF document text
    • http://likedizar.medianewsonline.com/75517035939.pdfIn PDF document text
    • https://cdn.sqhk.co/wexazaruko/gCiahiA/past_future_song_mr_jatt.pdfIn PDF document text
    • http://jobesagaponapa.22web.org/kendo_grid_column_html_template.pdfIn PDF document text
    • https://gizazegixewaner.weebly.com/uploads/1/3/4/5/134596748/b1a95acab5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390074/normal_6023ce419b273.pdfIn PDF document text
    • https://cdn.sqhk.co/wofunukasu/iazhdaZ/sidagoruvajedajuzufef.pdfIn PDF document text
    • http://larebalin.mypressonline.com/ikea_malm_full_bed_slats.pdfIn PDF document text
    • https://cdn.sqhk.co/bekutojeke/phixjd1/guide_for_swordigo.pdfIn PDF document text
    • https://cdn.sqhk.co/karadirimose/ieqRgh5/prodigy_math_game_hacking_extension.pdfIn PDF document text
    • https://cdn.sqhk.co/gisatajofo/ajKjcfM/wufufazagew.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xafamikipu.epizy.com/6374998192.pdfIn PDF document text
    • http://danesanifulen.rf.gd/87160320902.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_off0000fa1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA1D 5468 bytes
SHA-256: c4cb484dd798df53481ed42f1fa7582faa4ef72667d7ab588b4090efc3310e09
font_01_sfnt_off00010cb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB5 10296 bytes
SHA-256: dc904ffbb2674686ed176d36dcd12496b99b31b28a2fd8a9a8b31772361acf7f

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