Malicious PDF — malware analysis report

Static analysis result for SHA-256 935642d12a57a5e6…

MALICIOUS

PDF

76.1 KB Created: 2021-03-16 18:58:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd8ef5620b8d22f56be18bd99da7fd76 SHA-1: 80f0c3b09956a683f6ac28200c3da998b7b94571 SHA-256: 935642d12a57a5e6637685eee11c2d021c31c4b396cbaa00ea6e21c6f8419dcf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable hosting, suggesting it's part of a link farm designed to distribute malicious content or conduct phishing. The document body, though heavily obfuscated, contains metadata related to 'joint venture accounting', likely a lure.

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://druttle.ru/award?keyword=joint+venture+accounting+pdf
    • http://vasakuso.sportsontheweb.net/ruwama.pdf
    • http://maska-respirator.com/how_do_you_say_climate_in_frenchnjzpr.pdf
    • http://timurberg.ru/nuzov75c12.pdf
    • http://hydrofthol.space/zutejivefemefususapaopte2.pdf
    • http://korecos.ru/buferenanakukeramamofomonyw9m8.pdf
    • http://fruktovik.com/color_chat_discordee8tq.pdf
    • https://wavikifetin.weebly.com/uploads/1/3/4/9/134901048/3bae7e8fd.pdf
    • https://cdn.sqhk.co/bajowekununa/hjhdU8G/united_states_atlantic_fleet_ww2.pdf
    • https://cdn.sqhk.co/xurajalijok/igoUPjh/campus_parent_portal_jcps.pdf
    • http://mazikopipovix.mywebcommunity.org/bodadiroboli.pdf
    • http://english-10.site/red_rising_reading_ordermn4cp.pdf
    • http://nuxuzuruguli.mypressonline.com/easl_guidelines_ascites.pdf
    • https://cdn-cms.f-static.net/uploads/4376096/normal_6034fd7c94efa.pdf
    • http://kompledom.com/didegorufiroboxif2f26d.pdf
    • https://cdn-cms.f-static.net/uploads/4446272/normal_603e89fd67670.pdf
    • https://xonuguzuv.weebly.com/uploads/1/3/1/3/131382030/7139494.pdf
    • https://cdn.sqhk.co/baxotonad/5gdfijf/stickman_warriors_online.pdf
    • https://cdn-cms.f-static.net/uploads/4491451/normal_603ecab035591.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://duvodix.myartsonline.com/best_kits_to_learn_electronics.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_off0000ede6.bin
cd89e7af1d6f7c82c870dfa2c507ca3e93a39445d0b84be20c298618f2466d1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE6 5164 bytes
font_01_sfnt_off0000ff93.bin
17c9272886e2271a1cd9fe15a2c87c59654b23604625ee5b3f940e12d26832a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF93 10380 bytes

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