Malicious PDF — malware analysis report

Static analysis result for SHA-256 42bfc1250c3b6ab9…

MALICIOUS

PDF

72.7 KB Created: 2021-01-18 23:29:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: ed5c647f409137d53c79bbcc80ec2645 SHA-1: f456a4f2a7573de42321257b23aaea1ffbf011a1 SHA-256: 42bfc1250c3b6ab9de0bc2fa36b0d2d636bc8bb79788979645584d9c1837d88f
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded URLs, with one identified as a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to contain metadata related to the embedded links, suggesting a phishing or scam lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://gettraff.ru/123?utm_term=clearblue+advanced+ovulation+test+manual In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368466/normal_5f9729b367d63.pdfIn PDF document text
    • https://cdn.sqhk.co/dakuwuwuzije/hg7Nfja/playstation_experience_2019_december.pdfIn PDF document text
    • https://cdn.sqhk.co/vunalogivefu/iiGDVGb/star_wars_podracing_game_switch.pdfIn PDF document text
    • http://kurekarer.22web.org/cds_online_form_date_2018.pdfIn PDF document text
    • https://cdn.sqhk.co/pupumukisev/YVa4Hhg/war_of_legions_game.pdfIn PDF document text
    • https://cdn.sqhk.co/fularulojoze/ghjb7jc/escape_plan_2_movie.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417992/normal_5fec940d56367.pdfIn PDF document text
    • https://cdn.sqhk.co/nazopekujavi/gifAqge/gukosovakalefilujewe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369332/normal_5f9bd9ebe6e96.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xezeruv.epizy.com/carlisle_weather_report.pdfIn PDF document text
    • http://vizawog.epizy.com/ocean_currents_map.pdfIn PDF document text
    • http://vudatuvabejosix.epizy.com/13335486730.pdfIn PDF document text
    • http://vitupofelomar.epizy.com/shepparton_tv_program_guide.pdfIn PDF document text
    • http://firuxafuxu.rf.gd/66753902256.pdfIn PDF document text
    • http://diwuzenebixo.epizy.com/2641690029.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_off0000e0c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C3 5192 bytes
SHA-256: 683603a2789cb3162cc74ed18adce89e17129518874275402de56f8f398464bf
font_01_sfnt_off0000f251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF251 10292 bytes
SHA-256: 903bdcfdd477fc1033dc8f947c1fb8195a1207168bd45adafc2517d10ddfc6e8

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