Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f03ee06a7e7762a…

MALICIOUS

PDF

80.0 KB Created: 2021-09-12 11:14:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 588ffc6d928725715852b38bedfcc174 SHA-1: f3da3d5942668ae43a58cfbabe427c64df84940a SHA-256: 8f03ee06a7e7762adee9d22496acb952c0d944fdd04a4063073ceaf3392b1b77
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to various domains, suggesting a link farm or phishing infrastructure. The PDF structure and embedded URLs are consistent with phishing lures designed to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://oniceh.ru/uplcv?utm_term=remove+outlook+for+android+signature
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/ab51ae7c6cd28249c9931673480957cf/badezuzobudovoxosupow.pdf
    • https://gogift-it.com/userfiles/files/93416474555.pdf
    • http://www.electricman.in/demo/frontend/web/uploads/files/38013734915.pdf
    • https://tomclarkvoiceovers.com/userfiles/files/57207639268.pdf
    • http://renovfab-menuiserie.com/userfiles/file/zuturerusigakamo.pdf
    • http://lepal.sk/ckfinder/userfiles/files/petida.pdf
    • http://rivebistro.net/ckfinder/userfiles/files/74248264619.pdf
    • http://dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/lutolepisujakunaxi.pdf
    • http://www.louisianarebarcontractor.com/editorimg/file/feperojusovano.pdf
    • http://bidmitt.com/img/files/file/nolije.pdf
    • https://burstallconrad.com/editor_files/file/korisifexilupuvategepoge.pdf
    • https://heart-calligraphy.com/uploads/files/202109050000203869.pdf
    • http://feldbach-tourismus.at/files/getogar.pdf
    • https://topinsolventa.ro/userfiles/file/kujejagesotosuru.pdf
    • http://grandviewgroupresort.com/upload/files/45236216009.pdf
    • http://okvin.org/userfiles/file/dasutipesun.pdf
    • http://theexplorerthai.com/userfiles/files/tabizizotasenarex.pdf
    • http://architettipassarinmarzotto.com/userfiles/files/83142262828.pdf
    • https://advance-pack.com/editor_upload/file/karizevobi.pdf
    • http://fashionflutters.com/ckfinder/userfiles/files/85819249307.pdf
    • https://www.fangjin.org/ckfinder/userfiles/files/63307463692.pdf
    • http://regimhotelierbucuresti.com/images/userfiles/75543316416.pdf
    • http://myxroad.net/upload/userfiles/file///25553302108.pdf
    • https://laser123.com/geektic/files/biduti.pdf
    • https://hanurichurch.org/ckfinder/userfiles/files/derosodirojibij.pdf
    • http://toyteepee.com/uploadfiles/file/21090819262362016196sa1l.pdf
    • http://royalleasingny.com/admin/images/file/kewuv.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_off0000d4da.bin
11fcc9b839dc785beb448db1d27e756b320b3f801006b2ab2e6f6844114693d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4DA 16912 bytes
font_01_sfnt_off000100c8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100C8 16792 bytes
font_02_sfnt_off000118df.bin
5046d7f6b6fa12d65103f6a1d704f6ba6e1722303817d9a9dddba87438b5a50a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x118DF 11000 bytes

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