Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bc97e2df52b350d…

MALICIOUS

PDF

72.0 KB Created: 2021-10-03 00:01:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9c4afdf1aa3a49ce4597824164a6c00a SHA-1: 3166bd888fe23eb028e2d4e53baa2ebb73981edf SHA-256: 9bc97e2df52b350d5a3ca125a541f23de05a2409af47e01a5136c7b0c8524ab5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host numerous links on disposable domains, suggesting a phishing or malware distribution scheme. While no scripts were extracted, the embedded URLs point to a large number of potentially malicious or compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://ty-universe.com/image/files/20210914_112600.pdf
    • http://vijyaiprismcrm.com/userfiles/files/94987975983.pdf
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/3896927592.pdf
    • http://weiddy.com/uploads/files/202109080022416729.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16157495e6727b---28715820289.pdf
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/kitineja.pdf
    • http://fygl.net/uploads/file/280212205729.pdf
    • https://sayurmateng.com/contents/files/71830542469.pdf
    • http://playitdirect.ca/ckfinder/uploadfiles/files/puwemituwebav.pdf
    • http://epilia.com/upload/FCKEditorfile/kunizome.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/161314f607a78c---xofesa.pdf
    • http://xn--80adib9cjd8a5e.xn--p1ai/i/upload/files/firulora.pdf
    • http://metisentry.net/ckfinder/userfiles/files/nilajapaxozi.pdf
    • http://wowbond.com/upload/Fckeditor/file/51031093392.pdf
    • http://gioithieu.btccorp.vn/uploads/files/47952446221.pdf
    • https://supremeroi.com/FCKeditor/file/debegojagu.pdf
    • http://radis-rrl.ru/userfiles/image/fofodigunujasananafexubib.pdf
    • http://templeton.sk/userfiles/file/73355098254.pdf
    • http://jkbprivateiti.com/userfiles/file/boxonojudememe.pdf
    • http://studiotravenzolo.it/userfiles/files/8722999535.pdf
    • http://irvinenott.co.uk/ckfinder/userfiles/files/mojevomaloj.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=pregnant+dog+has+white+discharge
    • 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_off0000b413.bin
ada3ba7460afaf24ca5e85453fd26dc0ffa51aabf4f0f9b92d53c065eed66c90		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB413 17956 bytes
font_01_sfnt_off0000e234.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE234 16792 bytes
font_02_sfnt_off0000fa4b.bin
b66ca0e9c31dc5ff13eb22142e409b4d773584dff60ab802071072340a313a3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4B 10692 bytes

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