Malicious PDF — malware analysis report

Static analysis result for SHA-256 7439d0bea6662439…

MALICIOUS

PDF

77.4 KB Created: 2021-09-25 03:44:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7dd18725f315a02af40f2488a39071b4 SHA-1: 61fabf266fede4df3f1ec00a3d5e1692eca8f23a SHA-256: 7439d0bea6662439e553b14c725f21bbfda27992a638af5ff4ead183acb26386
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm on disposable hosting. The embedded URLs, though many are marked benign, point towards a deceptive purpose, likely phishing or malware distribution. The file's structure and the presence of numerous links suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://cerescommoditiesltd.com/Images_upload/files/93782463869.pdf
    • https://acp-luxusingatlanok.hu/ckfinder/userfiles/files/dudoxatikufi.pdf
    • https://pacpartner.net/images_client/imagesfile/17978968927.pdf
    • http://dreamcatcherltd.com/userfiles/file/75480704706.pdf
    • http://ducthanggroup.com/webroot/img/files/32311977718.pdf
    • https://musluogluotomotiv.com/upload/ckfinder/files/29919752619.pdf
    • http://cheapmarkt.com/userfiles/file/tekoropegot.pdf
    • http://spy-military-labs.com/userfiles/file/mupunawegamakanizonivip.pdf
    • https://clubkdo.fr/img/pics/files/19150833366.pdf
    • https://cncunse.com/d/files/rugefux.pdf
    • http://ap116.ru/userfiles/file/rotegazibufabonavak.pdf
    • https://rtvpuls.com/ckfinder/userfiles/files/5215433262.pdf
    • http://christopherdallo.com/file/safexetejawevele.pdf
    • http://jplus-ag.com/upload/files/BodyFile__613F01B0B4064.pdf
    • http://sadrokartonyhk.cz/images/fckfiles/file/74835459926.pdf
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bewolodopuveferu.pdf
    • http://vuoncotichdep.com/upload/files/16004941892.pdf
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/161366a1c8c1ab---kebodefezojubinubumiwe.pdf
    • http://otestmanager.com/club/data/userfiles/file/20210923012639.pdf
    • http://slsnn.ru/content/files/lisuvuroleleroza.pdf
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/c28380158a30aabb0afacc3d182accc2/24320016689.pdf
    • http://tvsatkrosno.pl/userfiles/file/natemir.pdf
    • http://prinsart.ro/uploads/files/ganuzibe.pdf
    • https://myagenda.myagenda.cz/pictures/editor/files/juxedujafezake.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=viber+free+download+for+iphone
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c6d5.bin
69dedc52bb4c6c90fee5acf03caaa9d8aa12a716680c948964ee14f30aa768ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC6D5 19052 bytes
font_01_sfnt_off0000f80c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF80C 16792 bytes
font_02_sfnt_off00011023.bin
ee1dd1cdcea5a076781b32de4613dc17462ba2c6dc114517ff88691807d3eacf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11023 10524 bytes

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