Malicious PDF — malware analysis report

Static analysis result for SHA-256 c517bdc04c757ce1…

MALICIOUS

PDF

85.9 KB Created: 2021-03-27 16:48:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 33363b3231c39834e0bf877c502309e7 SHA-1: 298449a13e50d20e1d4d9b4a808d5192d457b6c0 SHA-256: c517bdc04c757ce17861be325663506e192c8de76308b6f091e781cfc1c8fef1
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to appear as a resource while redirecting users to potentially harmful 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://xezojetit.ru/wix?keyword=classic+gospel+hymns+chords PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4369768/normal_60085cf4528ea.pdfIn PDF document text
    • https://cdn.sqhk.co/ranetixeba/ftghlMX/how_to_make_origami_dragon_eyes.pdfIn PDF document text
    • https://cdn.sqhk.co/bomagomax/CiizBii/unblock_ball_block_puzzle_level_52.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473916/normal_5fca058f12b97.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401518/normal_5fdbc3527b1b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455902/normal_604cb689751ea.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454420/normal_5fce7a77e1b92.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415322/normal_602ffb4d27711.pdfIn PDF document text
    • https://cdn.sqhk.co/laloropaki/dhvEHnK/axe_alliance_vs_empire_blademaster_skill_build.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417208/normal_601313142d862.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409107/normal_602c66bbd7b00.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402280/normal_5ff8c00fe0fe0.pdfIn PDF document text
    • http://zolozabaxozafa.iblogger.org/carcassonne_big_box_english_rules.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lebigegapil.epizy.com/57935758879.pdfIn PDF document text
    • http://xoguzed.epizy.com/dudekap.pdfIn PDF document text
    • http://jozadedosirokeb.rf.gd/cisco_academy_answers_chapter_3.pdfIn PDF document text
    • http://mevumum.epizy.com/apply_duplicate_marksheet_icai.pdfIn PDF document text
    • http://fivulesesixiji.epizy.com/rafuropukijizeged.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_off00011451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11451 5496 bytes
SHA-256: dbd0890e000bc0234cdc0cb3074a1e851c1a48f1751c1ad17295fcaaec436f6e
font_01_sfnt_off000126d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126D6 10576 bytes
SHA-256: 110b2a07a8dca92442f4c7aeabf0e03ec58ee79d7776dd569c929b65437eee48

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