Malicious PDF — malware analysis report

Static analysis result for SHA-256 585073e8f915fd35…

MALICIOUS

PDF

81.4 KB Created: 2021-09-15 21:30:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0c92a4f89f8fc8492f58a5f05e0fe8a3 SHA-1: 4a36494c1b0eee8f1e7ae5bf10ac878f1f7c2c1d SHA-256: 585073e8f915fd35ed14ce2ad56aef04176f942664d8148876398cf3f557b108
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which appear to be part of a link farm designed to obscure the ultimate destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a large number of low-quality links, a common tactic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://archism.ru/uplcv?utm_term=totok+apk+file+free+download
    • http://votava2.altrodesign.eu/ckfinder/userfiles/files/72589915558.pdf
    • http://thaicockstar.com/ckfinder/userfiles/files/37408885379.pdf
    • http://tcihk.com/userfiles/lukejolexonevonimoxiru.pdf
    • https://vidaleve.ind.br/ckfinder/userfiles/files/wirixeda.pdf
    • http://www.vinoplaza.nl/img/upload/files/32042507322.pdf
    • https://nilsahost.com/calisma2/files/uploads/radojovovijulesoboxevi.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141f3ed3f826---pafatusunagibo.pdf
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133fb5d0977b---milojinikatek.pdf
    • http://dailygiasi.com/uploads/userfiles/file/18436286667.pdf
    • http://thienlongadv.com/upload/files/xofanigadujado.pdf
    • http://www.vnv.nu/admin/library/ckfinder/userfiles/files/navinunomap.pdf
    • http://citysoupsbellevue.com/uploads/files/tozojisuwuvarewixuwareb.pdf
    • http://startmatbaa.com/userfiles/file/61995711462.pdf
    • http://a9188.com/upload_files/art_files/files/20210908_070010.pdf
    • http://madang.eu/f_pds/fck/file/88612817067.pdf
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/mitotujivoturu.pdf
    • http://www.smwiarus.pl/ckfinder/userfiles/files/jiduzikimoluruwidunajoz.pdf
    • http://jshtextile.com/UserFiles/file///vadakilojuzem.pdf
    • http://www.prunay-en-yvelines.fr/ckfinder/userfiles/files/22711799335.pdf
    • https://hanyauntuktesting.com/contents/files/xesiwokipobiremujuro.pdf
    • https://hosrem.org.vn/ckfinder/userfiles/files/58752211516.pdf
    • https://www.ftha.org/admin/ckfinder/userfiles/files/90038628805.pdf
    • http://delfosventures.net/userfiles/files/13190835237.pdf
    • https://sportuna.be/ckfinder/userfiles/files/77484261054.pdf
    • http://epicridesnepal.com/files/wonelozerurerelafosariban.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://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_off0000d852.bin
e8a8c7632ecdfdea32a59c87fba18b5f54c517083aa1b4d1276b040ff42c03d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD852 18556 bytes
font_01_sfnt_off00010821.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10821 16792 bytes
font_02_sfnt_off00012038.bin
0209858d334ce8aed504e67d7475ddfa463f62335d5925c55032d0de4459fcfb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12038 10464 bytes

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