Malicious PDF — malware analysis report

Static analysis result for SHA-256 6012b2809143d1df…

MALICIOUS

PDF

79.3 KB Created: 2021-09-13 02:00:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e8bcb3f16ae44e14b805904f02f5a4f4 SHA-1: fac1b7ea2b86e756d138b04247b5360a4792bd3a SHA-256: 6012b2809143d1dfd50c6009017f39a98f90061ddbb0c36932610f39f46da288
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 malicious intent. The presence of numerous external URIs, many on disposable hosting, suggests a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and URI patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://philabc.ru/uplcv?utm_term=free+image+editing+software+for+windows+10
    • http://dallard.fr/ressource/site-image/files/gujepobufum.pdf
    • http://wadsoda.com/UserFiles/File/waxumarukodugevogikisa.pdf
    • http://www.eurosecurimed.com/ckfinder/userfiles/files/rixutisoxajuzutubekujegud.pdf
    • https://ural-aiti.ru/admin/ckfinder/userfiles/files/gotewuwakexaxujotezixo.pdf
    • http://m-camper.ru/ckfinder/userfiles/files/82922216820.pdf
    • http://boxerdapolenta.com/cmsimple/images/file/520608508.pdf
    • http://grupposcorcia.it/userfiles/files/47076327912.pdf
    • http://cinebuzz.be/uploads/userfiles/files/kubizu.pdf
    • http://naphotelbangkok.com/userfiles/files/80942010108.pdf
    • http://akinmedikal.com/uploads/file/17528135174.pdf
    • http://nawoo.net/userData/board/file/37521841663.pdf
    • http://lightningriskassessment.com/ci/userfiles/files/79371005775.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9aef20031---32424882099.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f923711142---ketukevawanojilagupezege.pdf
    • http://fullcolorspandoeken.nl/userfiles/file/vapegamadudadupejub.pdf
    • https://thai-airpark.com/ckfinder/userfiles/files/88988250980.pdf
    • http://enjoybowlramenandpoke.com/uploads/files/46323589345.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_off0000d41c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD41C 16792 bytes
font_01_sfnt_off0000ec33.bin
82ca0c0d142e9d2e2dd09f563f5d0e5741e309133272cf59c1268efd1d41ecd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC33 10888 bytes
font_02_sfnt_off0001053f.bin
1efae966d6cf89a97441a47940659a20f63d22c643b36e70acef0b52950d24ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1053F 16600 bytes

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