Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6f84334d2c480e4…

MALICIOUS

PDF

82.0 KB Created: 2021-09-11 03:51:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a20c160e85da620a3c183d5dd0251f25 SHA-1: 5e4447aed89fe6b669356693cf8dd55ae9f8a857 SHA-256: c6f84334d2c480e40b236f09aa0f8a26ed884404f05995307362a611165f7577
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm, indicating a phishing or malware distribution attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting the PDF is designed to host a large number of links on potentially untrusted hosting. No scripts were extracted, but the overall structure and heuristics point to a malicious intent to redirect users to external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://pogologistics.com/ckfinder/userfiles/files/xukiraraxipazoxe.pdf
    • http://immopolignano.lu/images/pozetiruwibapukedin.pdf
    • http://aeon-dev.com/uploads/files/202109042311064576.pdf
    • https://perfecthospital.org/ckfinder/userfiles/files/42960582134.pdf
    • https://ooo-kenk.ru/userfiles/file/44699544472.pdf
    • http://tk-weld.com/images/library/File/75512459765.pdf
    • http://all-premium.com/user_file/files/rifopibukabi.pdf
    • http://casavacanzesanvito.eu/userfiles/files/bobodefepobiv.pdf
    • https://cortemadera.com/wysiwygfiles/file/zovabeves.pdf
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c114e7e7a---fudivuninufezejaw.pdf
    • http://ldkxzzs.com/images/userfiles/file/vupamita.pdf
    • https://legyenegyjonapod.hu/userfiles/files/890293380.pdf
    • https://pasarant0g3l-turbo-h1t.com/contents/files/13764131724.pdf
    • http://delfosventures.com/userfiles/files/51209242240.pdf
    • https://infosantiere.ro/userfiles/file/zerasugarosake.pdf
    • https://coopinproject.eu/ckfinder/userfiles/files/12031185927.pdf
    • https://dalilak1.com/userfiles/file/wajedamowabazagaginadu.pdf
    • http://kaies.cn/upfiles/file/91676209140.pdf
    • https://gopherscopes.com/userfiles/file/bebopugusokufejogozopulo.pdf
    • https://dalba.net/other_files/File/nifotamitisabevewutema.pdf
    • http://ghefootmassage.com/fckeditor_userfiles/file/33421222606.pdf
    • http://sake2metustin.com/uploads/files/luzodituzusoz.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=lock+screen+launcher+for+android
    • http://s250801404.onlinehome.fr/img/uploaded/file/dixifakejudosofub.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_off0000dc0d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC0D 16792 bytes
font_01_sfnt_off0000f41f.bin
4e48fabfafe2b03c5dc2c540e920aa8a9ff5ec8c07f4333aad143f20c3920a31		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF41F 17716 bytes
font_02_sfnt_off000121e8.bin
0d413952b6e6b5d62f50d479d8ee1d6afbf779ae703bc72fe21a132cc332f820		 pdf-font-stream PDF embedded font (sfnt) at offset 0x121E8 10624 bytes

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