Malicious PDF — malware analysis report

Static analysis result for SHA-256 a28dfc0f91c5f7e2…

MALICIOUS

PDF

72.2 KB Created: 2021-09-17 03:51:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d438d23ca2f71cb14fe7574be54e17df SHA-1: 158a8d327dc62bbc4930a9468716947f7010d6ca SHA-256: a28dfc0f91c5f7e293119cc3da4c8b1af1b5777ebf577e5045886ce4bd5fb4a7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. It contains numerous embedded URLs, many of which are part of a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The authoring application 'wkhtmltopdf' and the presence of embedded fonts are noted, but no executable scripts were extracted.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://huntic.ru/uplcv?utm_term=mortal+kombat+android+apk+hack
    • https://marathonroller.com/userfiles/files/komalagonekemi.pdf
    • http://zxpgw.com/userfiles/file/87160320597.pdf
    • http://www.parkwaytransplant.com/media_upload/upload/files/vixob.pdf
    • http://kingalbertltd.com/uploadedfiles/file/10089747294.pdf
    • https://coherence.cz/userfiles/file/5444895225.pdf
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d79b81a26---kifitenufifujagawikusa.pdf
    • http://shimamura-mail-order.com/userfiles/file/wufopesisewolij.pdf
    • https://ariaparvaz.com/basefile/ariaparvazcom/files/zemepubobotad.pdf
    • http://poexali.org/static/image/_u/system/files/72017003611.pdf
    • https://tsegypt.com/file/49416563402.pdf
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613568393a378---putejakuwiradafevojibake.pdf
    • http://cottoneauto.it/userfiles/files/49627403288.pdf
    • http://hyunsin.net/userfiles/file/73398316367.pdf
    • http://apexibd.com/uploads/fck_uploads/file/lagarafutogimojokexo.pdf
    • http://nessie-vinylcare.com/file/rolesakejetonusutefi.pdf
    • http://s-privod.ru/userfiles/file/26101164681.pdf
    • http://2m-m.eu/userfiles/files/58736227442.pdf
    • https://sankaibearing.com/userfiles/files/mibojagezirupejareni.pdf
    • http://storemisr.com/uploads/files/6983212957.pdf
    • https://portalbime.com/UploadedFiles/New/file/31853448472.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_off0000b7a5.bin
dae7d9e417447358eeba52ed187840c49092803db94263178f01791efc5710e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB7A5 16816 bytes
font_01_sfnt_off0000e326.bin
25b8a2303411350dcf501db2fc5a1372a1aad7c2118849df671e23e80d6f175c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE326 10704 bytes
font_02_sfnt_off0000fb38.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB38 16792 bytes

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