Malicious PDF — malware analysis report

Static analysis result for SHA-256 86391ec36d65b81a…

MALICIOUS

PDF

80.8 KB Created: 2021-09-21 12:19:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 14c0587fe50bcd18f84143b3156a022c SHA-1: 5984346fe5d91e1f8238105d87d8d6f90a7a34a5 SHA-256: 86391ec36d65b81ada0601389172a7ac0cb96c5dc9e68d05e3b2a3e537b60e0b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to potentially harmful websites, likely as part of a phishing campaign or to download further malicious 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 https://topinsolventa.ro/userfiles/file/pizoxezajulejebab.pdf
    • http://xn--80aafmoni2biho.xn--p1ai/admin/ckfinder/userfiles/files/rufixadudefovaxudo.pdf
    • http://centromedicoveterinarioadda.com/userfiles/files/4000066138.pdf
    • http://www.pvvc.cz/files/nukazerelefib.pdf
    • https://raiporjai.com/piceditor/file/mugevufuriluzevopudosepo.pdf
    • http://sport-zavora.cz/data/file/41125446144.pdf
    • https://protectname.xyz/whoisprivacy/userfiles/files/rimaperimera.pdf
    • http://seksdagen.nl/userfiles/file/koxamisok.pdf
    • https://zbmbudomont.pl/userfiles/file/43624076047.pdf
    • https://ihappywash.com/uploads/files/202109091653365106.pdf
    • https://hkparkkonutlari.com/image/files/94888027559.pdf
    • http://dsfly.com/uploads/files/51668632651.pdf
    • http://railwaysrailroads.com/upload_files/files/20140627718.pdf
    • https://bearings.vn/images/ckeditor/files/gajoxowugozuxuzosipogal.pdf
    • https://qfse.co/images/uploaded_files/ckfinder/files/1631821893_e9d45e7ee1.pdf
    • http://ecohouse-lab.com/userfiles/file/89166879038.pdf
    • http://hyosangjo.com/userfiles/file/20210910140132.pdf
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec89253df0---52234017170.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e1ed2a6950---56491511462.pdf
    • http://hbaoge.com/upload/files/tijunufiteriwefawi.pdf
    • https://sgotomotiv.org/upload/files/82187777457.pdf
    • http://sozopolihills.com/userfiles/file/18460781993.pdf
    • https://mayphotocopydogia.com/upload/files/9767932369.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=block+puzzle+download+apk
    • 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_off0000d643.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD643 16792 bytes
font_01_sfnt_off0000ee55.bin
7e909e6e8d2d1313b9e5dbc3a83f1aa4f1091735da6fff65302f27354e485897		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE55 18252 bytes
font_02_sfnt_off00011dc5.bin
78e32c8e673e55ba08a154b7ea5920d5ba39b3a0f053c05c97105a75e24a3ab2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC5 10440 bytes

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