Malicious PDF — malware analysis report

Static analysis result for SHA-256 c29b080e52d68bf8…

MALICIOUS

PDF

81.2 KB Created: 2021-09-10 02:21:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: caf1c95c1ef658e44faf1ce274bda545 SHA-1: 5476022fc33dcefc23d5dd42b7882a317cd6f976 SHA-256: c29b080e52d68bf8219a33ee42820b3519fe6383494b767ed98ccf528caa9737
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to disposable hosting and are used in a link farm configuration, indicating an attempt to direct users to potentially harmful sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent to obscure the true destination or distribute various malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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=where+apk+is+stored+in+android
    • https://myclubowners.travelenvogue.com/userfiles/files/ganudobezapevu.pdf
    • http://getampedmag.com/ckfinder/userfiles/files/52054672541.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161315a8a36402---40128577710.pdf
    • http://salukool.ee/upload/userfiles/file/70243732684.pdf
    • https://aldurra.ly/images-editeur/img/file/tulujoson.pdf
    • https://loffoxfitness.mvwebsolution.com/userfiles/files/46312470113.pdf
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/87886499932.pdf
    • https://abofahed.com/userfiles/file/kuwewizugemazuzo.pdf
    • http://proxima-design.cz/files/file/fukuxajivodori.pdf
    • http://dainindo.com/Uploads/userfiles/files/jatojidebulewowonezugeta.pdf
    • http://schodylux.pl/userfiles/file/90512512903.pdf
    • http://bobas24.pl/Upload/file/molazufupow.pdf
    • http://virtualcharityevents.com/vce_cake/files/files/kefupenajititojebufemi.pdf
    • https://cvssteelex.com/ckfinder/userfiles/files/papifatiw.pdf
    • http://tydafa.com/dafa/uploadfiles/20210907202938.pdf
    • http://www.andreapondika.cz/file/48493640911.pdf
    • http://hostingureitings.lv/uploads/userfiles/files/pebef.pdf
    • https://www.lire-les-notes.com/ckfinder/userfiles/files/padudosotef.pdf
    • http://www.gyndoktors.de/ckfinder/userfiles/files/ritog.pdf
    • http://ferramentabelleggia.it/public/file/zurulezinipevol.pdf
    • https://paeonia.ch/userfiles/files/rexodifupos.pdf
    • http://lexprikson.com/admin/style/images/userfiles/file/48955053852.pdf
    • http://designerhouse.ru/upload/files/28274587483.pdf
    • https://rt9.rspo.org/ckfinder/userfiles/files/pujabedafakixijojumekofe.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_off0000d7b1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B1 16792 bytes
font_01_sfnt_off0000efc3.bin
415fe89ca677ed05f4f846dcee5b60116819802e9ab9a79261052fccfb156b66		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC3 18024 bytes
font_02_sfnt_off00011ecf.bin
6c8287d9a23d429ac099d7468c2b44c2c316076a705006b76b904afdfb54c856		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11ECF 10528 bytes

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