Malicious PDF — malware analysis report

Static analysis result for SHA-256 4eb635f7a0190567…

MALICIOUS

PDF

68.2 KB Created: 2021-04-01 09:36:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8fefadd5d22b24e3fa19507507c7e23c SHA-1: 7780c7e0fb168c94668c9a3df558c7bd3eb24353 SHA-256: 4eb635f7a019056794ed9a241d3001011d90dd4e7c88246c878fb5823d7d3d9d
134 Risk Score

Malware Insights

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

The file is a PDF document flagged as malicious by ClamAV and an ML classifier. It contains multiple external URIs, including one that appears to be a redirector with a 'utm_term' parameter, suggesting a phishing or spam campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of hosting numerous PDFs on disposable domains, further supporting a malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the overall detection profile strongly suggest this PDF is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://kuzutuzo.ru/strik?utm_term=primo+water+cooler+service
    • http://wedevaz.sportsontheweb.net/what_girl_names_mean_powerful.pdf
    • https://static.s123-cdn-static.com/uploads/4468294/normal_5fffd05657280.pdf
    • https://dutofubexel.weebly.com/uploads/1/3/4/6/134631161/pivobuzumu_xusitoselupok_fajezexisiwalor.pdf
    • https://static.s123-cdn-static.com/uploads/4454046/normal_5ff8b90b45c4f.pdf
    • https://cdn-cms.f-static.net/uploads/4388157/normal_600bd3a6de586.pdf
    • https://cdn.sqhk.co/sidamebo/fmgdgge/17861452142.pdf
    • http://kopalirigel.mypressonline.com/adobe_reader_x_edit.pdf
    • http://mexevuk.iblogger.org/brujas_de_salem.pdf
    • http://tarigutese.mygamesonline.org/arecanut_tree_climber.pdf
    • https://wojaginobaxap.weebly.com/uploads/1/3/1/8/131857211/muzul.pdf
    • https://cdn.sqhk.co/kutajanode/hgHUgeW/93507755029.pdf
    • https://cdn.sqhk.co/zisuxemop/17Sgx3u/77422401742.pdf
    • http://gatowixipeba.mywebcommunity.org/how_to_clean_a_speed_queen_washing_machine.pdf
    • https://cdn-cms.f-static.net/uploads/4365567/normal_6033d0c24d6c7.pdf
    • http://sexugaweguko.iblogger.org/treatment_of_acne_vulgaris.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://buwifojozoziden.atwebpages.com/abbyy_transformer_3._0_serial_key_generator.pdf
    • http://vedixemalirugi.atwebpages.com/30691700441.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_off0000cf6f.bin
6058be4ef4ff2dc590326c61815dc56be775739e1cfe2708767080f745735baf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF6F 5100 bytes
font_01_sfnt_off0000e0c4.bin
750d1f9d33cb8bf2dbd349b6b9a023f109abe0180b4bc0a3f9791cc493d7d1bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C4 10392 bytes

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