Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e6fa6a9961a62ce…

MALICIOUS

PDF

69.8 KB Created: 2021-09-24 22:12:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1fd3374a4645f8b5e36c057009354045 SHA-1: b1cb5e661745cf1411c6cabc13d8d196a621067c SHA-256: 5e6fa6a9961a62cece0d7712626369900b4353fa29fcb4b4d3d9c72651afe105
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged by ML and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using many distinct, low-reputation domains to obscure the true malicious destination. The presence of embedded URLs suggests the document's primary purpose is to redirect the user to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://inwebjor.ru/uplcv?utm_term=robinson+crusoe+pdf+free
    • https://directorvincentchow.com/fck_filemanager_upload/file/16833868964.pdf
    • http://uzmansporzeminkaplama.com/resimler/files/tuduz.pdf
    • https://datenglagi.com/contents/files/55533751823.pdf
    • https://juniorclublivorno.com/sitonews/images_upload/files/bivufixaxu.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612edcbfde7ac---67908419873.pdf
    • http://zs-oilfieldequip.ru/d/files/koragam.pdf
    • http://assytekservizi.com/userfiles/files/91739759598.pdf
    • https://capital-publishing.com/ckfinder/userfiles/files/53485924520.pdf
    • http://togclick.com/media/userFckfiles/file/gasoxopuzewazebojowiwodof.pdf
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/dutekife.pdf
    • http://petukmahaaaraj.com/userfiles/file/94667292710.pdf
    • http://studiophotosfashion.it/userfiles/files/67099985071.pdf
    • https://festivaldelmaridaje.com/sgi_userfiles/userfiles/files/punevazarixudidekis.pdf
    • http://t-cso.com/upload/file_folder/file/lojusirasewugigux.pdf
    • http://didopack.com/files/fujuviro.pdf
    • http://veterinariomauracotti.it/userfiles/files/xizujezaxemenog.pdf
    • http://chiangmai-esc.net/user_img/files/dumedugija.pdf
    • https://idealist.ro/userfiles/file/zinepadewosef.pdf
    • https://theatresaucinema.fr/uploads/file/tapufarinopof.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_off0000ae3b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAE3B 16792 bytes
font_01_sfnt_off0000c64d.bin
0d0f096be250c40271092990760166867df78a9e6c38233bd0a02e08dcb4deae		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC64D 17208 bytes
font_02_sfnt_off0000f1e1.bin
bceff63f993c997faf617bcbd5b66945948e2f83aeb71f9ea340fb9a0912095c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E1 10592 bytes

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