Malicious PDF — malware analysis report

Static analysis result for SHA-256 29406f0e61a9282e…

MALICIOUS

PDF

79.4 KB Created: 2021-09-19 15:29:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c9fe03c6ec5aaa0236bf652bbebdd834 SHA-1: c27b9c8130cc0efe8df53e94a746a76f21a2f5aa SHA-256: 29406f0e61a9282eed7442d8fcd6c0dc83881114be477493b7440b15aea3d1fa
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains a large number of embedded URLs, many of which point to disposable domains or are structured as link farms, indicating a likely attempt to redirect users to malicious sites. The presence of 'utm_term' parameters suggests tracking or phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://cructi.ru/uplcv?utm_term=how+to+draw+a+bunny
    • https://momsgardenfoods.com/ckfinder/userfiles/files/kasovepotivevixafabaled.pdf
    • http://lmnn.ru/userfiles/file/wipibimog.pdf
    • http://bilafafafa.com/shopadmin/upload/files/fukupok.pdf
    • https://chineseclothingonline.com/File/17749641517.pdf
    • http://angelojrobles.com/admin_initial_test/userfiles/file/2317562653.pdf
    • http://fygl.net/uploads/file/060436177594.pdf
    • http://desushibar.com/userfiles/file/kowodakax.pdf
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612f004915737---25237248548.pdf
    • http://starfishdowney.com/uploads/files/87662517994.pdf
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/fukoviwiwudosusamomosomam.pdf
    • https://matfreklam.com/calisma2/files/uploads/72039694881.pdf
    • http://colorfusion.us/admin/images/file/76587166344.pdf
    • https://kapokcmassage.com/uploads/files/202109061611303303.pdf
    • http://tlxzkj.com/uploads/file/081912495730.pdf
    • https://brincandoeaprendendo.com/fotosempresa/files/27800736656.pdf
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137f330a2b47---zabuvarabazipobewijotu.pdf
    • https://innotek.vn/uploads/news_file/xadinera.pdf
    • http://joyearland.com/ckfinder/userfiles/files/vudojirapexubagemopelusip.pdf
    • https://griby.biz/ckfinder/userfiles/files/90007302219.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_off0000d6c2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C2 16792 bytes
font_01_sfnt_off0000eed9.bin
ded6d97f12ada2d2b43e72c42523fb5e827229eae3a8e1ea9e325e8760d5d81b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEED9 10232 bytes
font_02_sfnt_off000105e7.bin
5da63133b6e7942510e15c1be04b7e3bbef06ce7018f1b123565a85faa17fabe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105E7 16576 bytes

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