Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7eb8937940b82a0…

MALICIOUS

PDF

69.8 KB Created: 2021-09-24 21:18:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2172289505972b75439633dd8d7cbd83 SHA-1: abff9ed53bee640c73a0e930fa5160091378b2df SHA-256: d7eb8937940b82a0438652b8f90490fdabd2bc6ac81b063859a7df5f009035a0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which point to disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to obfuscate the links or perform malicious actions upon opening.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://irlanc.ru/uplcv?utm_term=watch+mayweather+paul+free
    • http://wagnerpc.com/userfiles/files/32545339346.pdf
    • https://hebatkeren88.com/contents/files/bepifezosemogiremuket.pdf
    • http://thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/46338646599.pdf
    • https://infrastone.com/userfiles/files/62872328457.pdf
    • http://infoegrafica.com/userfiles/files/6313702806.pdf
    • https://madame-tina.com/ckfinder/userfiles/files/1360536889.pdf
    • http://inannamsao.com/uploads/files/37639986320.pdf
    • http://loca-granderoue-montaletang.com/ckfinder/userfiles/files/77399895396.pdf
    • http://okuninka-biale.pl/userfiles/file/10063934575.pdf
    • http://templeton.sk/userfiles/file/37483356226.pdf
    • http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/litonakub.pdf
    • https://essaidafm.com/uploads/FCK_files/file/ragigolezoxupuwodat.pdf
    • http://urotunisia.com/uploads/FCK_files/file/fevomevigeporol.pdf
    • http://dytac.hk/userfiles/80065700466.pdf
    • http://nature-revive.org/files/file/lafusomakazex.pdf
    • https://purevdavaa.mn/uploads/ckfinder/files/kanek.pdf
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/d7ca6oojlp5ts1u0q5o6u6ht4m/59254170612.pdf
    • http://serenetour.com/image/upload/File/66828623726.pdf
    • https://sasalidayanisma.org/uploads/file/36507406226.pdf
    • https://groupekheidri.com/ckfinder/userfiles/files/19630189915.pdf
    • https://nsaimmigration.com/userfiles/file/47732965003.pdf
    • http://keyflounge.nl/userfiles/file/ranisifotovot.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_off0000af31.bin
9ff00c0f2f62cb8923aab81087ac41bec117716af0bdab066a0e52fe313aa582		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAF31 10556 bytes
font_01_sfnt_off0000c75a.bin
8e0dd58bfca639101aadaf9d3202188fce54678a7aff9a646e9604f8ad4529aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC75A 16856 bytes
font_02_sfnt_off0000f1f7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F7 16792 bytes

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