Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0bebcfc5b348764…

MALICIOUS

PDF

77.0 KB Created: 2021-03-31 16:27:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3b5450b0ed5bce9c905c2a811170f3d4 SHA-1: 716d7854531f88192c2d281ff3916598d8522ca6 SHA-256: c0bebcfc5b3487644ef608dd4eeac8535f1f6f2659a70fc5b58c482883c876df
126 Risk Score

Malware Insights

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

The PDF contains multiple external URLs, with one specifically matching the document's apparent search query. The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests a tactic to obscure the true destination by using numerous disposable domains. No scripts were extracted, but the presence of external links and the overall detection profile point to a phishing or malware distribution attempt.

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/award?keyword=basic+formulas+in+chemistry+pdf
    • http://xalenupom.getenjoyment.net/convert_arabic_to_english.pdf
    • https://mekegeno.weebly.com/uploads/1/3/1/8/131856852/4837456.pdf
    • https://cdn.sqhk.co/jogepirar/BjggjDn/twisted_sister_stay_hungry_full_album.pdf
    • https://cdn-cms.f-static.net/uploads/4456984/normal_602c13d92e1b8.pdf
    • http://rotawafuwuno.scienceontheweb.net/vitol.pdf
    • https://cdn-cms.f-static.net/uploads/4420030/normal_605ce585c862c.pdf
    • https://cdn.sqhk.co/fekepazerox/3hfIhhy/dudisivufobilo.pdf
    • https://cdn.sqhk.co/nefakovuwot/je2jj0s/jukuponuwafiri.pdf
    • https://static.s123-cdn-static.com/uploads/4454672/normal_5ffaa8e58d008.pdf
    • https://papobujiwirila.weebly.com/uploads/1/3/1/4/131453114/eff93bb7b.pdf
    • https://xujokutiw.weebly.com/uploads/1/3/4/7/134749543/137a87.pdf
    • https://lerelapukuvi.weebly.com/uploads/1/3/0/7/130740054/4591176.pdf
    • https://cdn-cms.f-static.net/uploads/4467007/normal_5fd341f79931c.pdf
    • https://cdn.sqhk.co/minamojazi/eGjh2ZK/jelly_band_hand_sanitizer.pdf
    • https://cdn-cms.f-static.net/uploads/4377101/normal_5fd3781701786.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gowebabuxogiro/vietnam_insurance_market_report_2018.pdf
    • https://s3.amazonaws.com/xupimaral/best_priest_leveling_guide_classic_wow.pdf
    • https://uploads.strikinglycdn.com/files/4ba97aba-5699-40a5-bf2c-1aebca6e80e9/22226216998.pdf
    • https://uploads.strikinglycdn.com/files/589cb6ac-effc-415e-bf07-e19866835c95/minn_kota_talon_15.pdf
    • https://uploads.strikinglycdn.com/files/82762786-867e-48af-b112-aef754b72f08/where_to_get_mini_cooper_s_service_intervals.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec56.bin
2a6e5b88b4834e971d7e808d9b302160afd16b0e98530ff149f514611c752644		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC56 5544 bytes
font_01_sfnt_off0000ff10.bin
2fae4d3ea6aaf9b0746b67c3be14a8114f9238f573b1e30dedd16f4f9e9f9d24		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF10 11948 bytes

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