Malicious PDF — malware analysis report

Static analysis result for SHA-256 060fa6f3165e5d64…

MALICIOUS

PDF

70.8 KB Created: 2021-10-04 09:18:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 208b1996d014a03d90f989c27c5635cf SHA-1: d01c9bfc26fff496f3aad277c3e1702157d880f8 SHA-256: 060fa6f3165e5d64b014a1be68b1f18b03611c289e2a543844c8ac9c6f1bd228
166 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, with high-severity heuristics indicating it is a PDF with random, algorithmically-generated URLs. The PDF structure and numerous embedded URLs suggest it functions as a link farm, directing users to a large number of other PDF files hosted on disposable domains, a common tactic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://huntic.ru/uplcv?utm_term=places+to+eat+near+grapevine
    • https://mantyobras.com/userfiles/file/pimupiguj.pdf
    • http://donovaly-ubytovanie-safran.sk/web/userfiles/file/luvinagopubegojumotemof.pdf
    • https://rozynoklinika.lt/userfiles/file/75903741417.pdf
    • http://askaudit.ru/price/71192449534.pdf
    • http://www.rpv-drachten.nl/files/file/29245264938.pdf
    • http://av-jet.ru/userfiles/file/29639869445.pdf
    • http://vimar.ua/userfiles/files/72676159138.pdf
    • https://jurad.eu/files/file/gekusus.pdf
    • https://maturana.cl/upload/file/6836693280.pdf
    • http://ambulatorioveterinariosantanna.eu/userfiles/files/siwapexafitomofizibufiva.pdf
    • http://squarcialupirelaxinchianti.com/writable/public/userfiles/file/92889615197.pdf
    • http://xn----dtbsgbucafmmaf.xn--p1ai/servimages/editor/files/guzevuduwivesobududefera.pdf
    • http://bavlas.lt/ckfinder/userfiles/files/55650569506.pdf
    • http://madiran-cruduparadis.fr/ckfinder/userfiles/files/34153604357.pdf
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/67655882240.pdf
    • http://ambvetbrashersclavoghisu.eu/userfiles/files/3575376842.pdf
    • http://digitalqwerty.com/ckfinder/userfiles/files/bimunotududivesigi.pdf
    • http://diplomat2014.ru/ckfinder/userfiles/files/gopofutuxa.pdf
    • http://xaydungphongphu.com/uploads/files/zakoruvoduxuzuwa.pdf
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/sa7po7molfopke167p0j708d10/maduzitobupunasogisiser.pdf
    • http://arcomproltd.com/userfiles/file/gixejumusujaz.pdf
    • https://habibitours.net/ckfinder/userfiles/files/58688720307.pdf
    • https://lochoanggia.com/upload/files/29652443264.pdf
    • http://youzedu.com/ckimages/files/20210903160141289651.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_off0000b368.bin
363c1604febd7c1fcce378dba4b99831a83da5b347ca4c0474a74bf7a0f7959c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB368 16396 bytes
font_01_sfnt_off0000dcf9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF9 16792 bytes
font_02_sfnt_off0000f510.bin
ff410ceab0151cfffb38ec2b5f35725f0c72ccfe7e6a9c546b571c8230cfbf67		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF510 10616 bytes

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