Malicious PDF — malware analysis report

Static analysis result for SHA-256 54847417986d8307…

MALICIOUS

PDF

80.3 KB Created: 2021-09-17 21:05:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a6b208e949f58cfcd5e45d8f365e11a8 SHA-1: 6ccc5b950b4a8aed0864f6302eadec5b2ec891c7 SHA-256: 54847417986d83072be03eb7c921bf914e0f4bce7972e10ef027da696ee18db0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is identified as a link farm on disposable hosting, strongly suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection further confirm its malicious nature. Although no scripts were explicitly extracted, the PDF structure and embedded URLs indicate an intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://wastran.ru/uplcv?utm_term=pepsi+man+game+download+for+android+apk
    • https://samavetpharm.com/userfiles/files/12849865956.pdf
    • https://el-tall.pl/pics/file/25834616448.pdf
    • http://karat-dobremiasto.pl/userfiles/file/jewuxaborumekanazofagumuj.pdf
    • http://trubaopt.ru/content/file/tekokalujelemirowumunidij.pdf
    • http://leicesterbiketec.com/userfiles/file/33729413925.pdf
    • http://ingegneriarossi.it/userfiles/files/27733001730.pdf
    • https://mclandpin.com/calisma2/files/uploads/31344279633.pdf
    • http://happyland-nsk.net/ckfinder/userfiles/files/jepivomolinanodaxi.pdf
    • http://prttour.ca/FileData/ckfinder/files/20210905_63C75D372750E74E.pdf
    • http://espwireless.net/uploads/file/53289664486.pdf
    • http://sluchatka-shop.cz/files/upload/files/wetalo.pdf
    • http://calisnt.com/uploads/files/19728485182.pdf
    • http://copy2d.com/ftp/image/file/43874894674.pdf
    • https://kaunas.cvzona.lt/resources/img/files/32171153607.pdf
    • http://pantanalmsnews.com.br/ckfinder/userfiles/files/datuxoji.pdf
    • http://sportingclubalbinia.eu/userfiles/files/69582864219.pdf
    • https://vinatech.com/userfiles/file/jimuwibufefipadixate.pdf
    • https://phuquiland.com/upload/files/budogozibopakeberakolaf.pdf
    • https://biogenetixpharma.com/ci/userfiles/files/59793566021.pdf
    • https://polresseluma.com/assets/ckfinder/core/connector/php/uploads/files/ruwitota.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/161363fe8b8590---17230394487.pdf
    • http://aotem.com/data/home/qxu1780220113/htdocs/uploadfile/files/98570089852.pdf
    • https://icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/tadunototuniwosorizukevi.pdf
    • http://intertexmedical.com/userfiles/files/3133361771.pdf
    • http://autoscuolauniversale.it/userfiles/files/52524796776.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_off0000cde2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCDE2 16792 bytes
font_01_sfnt_off0000e5f9.bin
3d261a5cb19d98e2c4db63e6bd5af9a9a7e0e4dc06eb16abc0588cc694404ba4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F9 10924 bytes
font_02_sfnt_off0000ff16.bin
ad6d283a3583f0bd0b5aa3a172562490ce459d0272e99d9acc3d9ce36dd92545		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF16 19436 bytes

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