Malicious PDF — malware analysis report

Static analysis result for SHA-256 900326232d25ad49…

MALICIOUS

PDF

85.4 KB Created: 2021-09-24 01:00:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 92a0e9bb1a62fe57543346007e0d45cb SHA-1: 15823aa11233caa048cfb03172cf022150d65d47 SHA-256: 900326232d25ad49a023aab9d70fa298f1df3440c50cc6c634bc2ab5b81c7d1d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm on disposable hosting. The PDF contains numerous external URIs, with the primary one being https://infrive.ru/uplcv?utm_term=assassin%27s+creed+heresy+pdf. Although no scripts were explicitly extracted, the PDF structure and the presence of external links suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://infrive.ru/uplcv?utm_term=assassin%27s+creed+heresy+pdf
    • http://saringkarnwood.com/UserFiles/file/3753959643.pdf
    • http://www.polni.si/Images/files/wapajemowivofure.pdf
    • http://uzmansporzeminkaplama.com/resimler/files/xejawoxavabuborogipo.pdf
    • https://bongkartuantakur.com/contents/files/mikojixawufevugunedifelis.pdf
    • http://visusmarble.com/images_upload/files/2562396578.pdf
    • https://karapinarinsaat.net/userfiles/upload/file/vusanok.pdf
    • http://natalieshuff.com/uploads/file/tutigaduzosuduwa.pdf
    • https://groupburuemas2.com/contents/files/53502742665.pdf
    • https://tunguoilon.tunhua.vn/ipp/images/uploads/files/podoxasuposajixapo.pdf
    • https://europawindow.com/app/webroot/img/main_content/files/livemusikopesolati.pdf
    • https://www.natursany.com/ckfinder/userfiles/files/dofapoxilepi.pdf
    • https://zhavezbozi.cz/data/file/pukovelujivetezo.pdf
    • http://audyt.rowerowaszkola.pl/imgturysta/files/kodikuponig.pdf
    • https://webornate.com/viking1/uploads/files/63187175786.pdf
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/6671888961.pdf
    • http://kovospm.cz/fotky/file/jisewesudomowezisum.pdf
    • http://lecieldesandes.fr/ckfinder/userfiles/files/puvinamaf.pdf
    • http://dangkydoanhnghiep.org/hinhanh_fckeditor/file/73215651444.pdf
    • http://virtualcharityevents.com/vce_cake/files/files/58003386974.pdf
    • http://vilocom.net/webroot/img/files/ninijumiginon.pdf
    • http://trust-law-firm.com/userfiles/file/20210902175625_1893804029.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_off0000e864.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE864 16792 bytes
font_01_sfnt_off0001007b.bin
f0388cec90ce80e3b9a2395577f3b858e0a5ec7f2d8fbe1be63f2eee2f70b076		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1007B 10584 bytes
font_02_sfnt_off00011899.bin
67e3621e9a0745648b5182f3bee7651c9a98e091a3bcf85586e1dce98f8d56c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11899 18684 bytes

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