Malicious PDF — malware analysis report

Static analysis result for SHA-256 6543cd401ab14a09…

MALICIOUS

PDF

79.6 KB Created: 2021-09-18 09:48:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 41d4a8fd1307eb60fdff72ac80d52902 SHA-1: f7c655b90352363fabfa9e09ff13177e6a5842f7 SHA-256: 6543cd401ab14a0943e551808b024d37a3011d20ab4a11cdbbc739cf25cb4f28
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous embedded URLs pointing to external sites, some of which are identified as link farms. The ClamAV detection indicates it's a phishing or trojan variant. The primary attack pattern involves directing users to potentially malicious external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://centralcogtc.com/uploads/file/mogesetuvewu.pdf
    • http://at2apigroup3.com/contents/files/1092132655.pdf
    • http://eshop-kocicinadeje.cz/files/file/roneba.pdf
    • http://imbirimbir.ru/files/ditavuj.pdf
    • http://c-six.it/userfiles/files/borawis.pdf
    • http://traktor-tv.de/sites/default/files/file/55170866539.pdf
    • https://fundacjanadzieja.com/images/wyswig_images/file/39724704522.pdf
    • http://photou.cc/ckfinder/userfiles/files/31416756233.pdf
    • http://kindergartenhelden.at/upload/file/15681226619.pdf
    • http://kp-technik.cz/ckfinder/userfiles/files/kujasamukakorene.pdf
    • http://carzip.biz/files/uploads/files/8138919156.pdf
    • https://sunsoftinfoway.net/ckfinder/userfiles/files/pupuwibaleteserulodo.pdf
    • https://partroyfuneralhome.com/partroy/assets/file/24790746834.pdf
    • https://semut73.com/contents/files/vudukorezajatifa.pdf
    • http://tech-sub.com/userfiles/file/tolusadet.pdf
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161401ab93682c---87475611360.pdf
    • https://segurodegranizo.ar/noticias/fckeditor/file/71930785245.pdf
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16141641c19899---vibitelo.pdf
    • http://cayxaotamphan.net/userfiles/image/file/41611122535.pdf
    • https://szallas-karpatalja.net/upload/32782645164.pdf
    • http://pnc21.com/files/fckeditor/file/207309448461407973bcc73.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=gg+game+hacker+apk
    • 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_off0000d505.bin
8934e6bb09225905728525c7ba93af48944fb1ecbf5adf89674f4114a694e3b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD505 10324 bytes
font_01_sfnt_off0000ec4c.bin
8ae98c5f4c57fb1164e107bcc8fda903f2ef9a31791e357c20d4670aff4b6281		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4C 17384 bytes
font_02_sfnt_off00011976.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11976 16792 bytes

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