Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c34dac34edc6d23…

MALICIOUS

PDF

70.0 KB Created: 2021-03-03 21:45:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 685a78bf9c33718567888a4f7dda92c1 SHA-1: a414ce224826987fad536e74b1a2c02d4349aaee SHA-256: 4c34dac34edc6d234e5a1a16168d009468278f040f46721b5c5374dbfacbb373
126 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates a non-clustered link farm on disposable hosting, reinforcing the malicious intent. No scripts were extracted, but the presence of many external URIs suggests the document's primary purpose is to redirect users to potentially harmful sites.

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
  • 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://dafemum.ru/aws?utm_term=crkt+operation+iraqi+freedom+knife+m16-13z
    • http://pr-bux.online/hormann_supramatic_e2cbtyo.pdf
    • http://interior.estate/naparaluzoxerelexi5kt.pdf
    • http://studyweb.site/weight_training_for_dummies772q0.pdf
    • http://55571.ru/25173103876mhoq3.pdf
    • http://nerroba.info/us_sba_business_plan_templateuxw3z.pdf
    • http://ukranews.site/compass_learning_us_history_answersufcfj.pdf
    • http://defiboxifef.22web.org/how_to_tell_if_your_golf_cart_controller_is_bad.pdf
    • https://pejedakava.weebly.com/uploads/1/3/1/4/131453393/3938623.pdf
    • http://timatesanuvufav.iblogger.org/wexedejemewaros.pdf
    • http://xruhdfo.site/sexokilisosemoworunazida80uu0.pdf
    • https://fakazurirogedim.weebly.com/uploads/1/3/4/7/134743668/xefarizigijolaka.pdf
    • http://adv-workshop.site/venta_humidifier_lw45uqgjs.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://sisawujeza.rf.gd/biomes_of_the_world_packet_answer_key.pdf
    • http://xofaxisenulomav.epizy.com/99416114357.pdf
    • http://zuluduk.epizy.com/toro_824xl_snowblower_parts_diagram.pdf
    • http://xesufarojix.epizy.com/xulogaveg.pdf
    • http://pifazudiso.rf.gd/73631904801.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_off0000d0d0.bin
e87fccf44cdd2930684752d20b894d2977f5cd2169bf81c67025a3f2c1c849a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD0D0 5524 bytes
font_01_sfnt_off0000e39a.bin
ab0a3e81d209fd8f36ecf4e0dbbab4d17e571b788be889880626742123302301		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE39A 10952 bytes

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