Malicious PDF — malware analysis report

Static analysis result for SHA-256 3179757febe549a3…

MALICIOUS

PDF

82.2 KB Created: 2021-09-08 19:34:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 32160c1c23bb437f0f46938b6b432580 SHA-1: 82bc16ef7a0026c74378e5f93acbaf0411311e1a SHA-256: 3179757febe549a380903227af001f975fb0866251b87d60be79a28e56214f95
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to a link farm, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://grafconsulting.pl/Upload/file/luxugojuse.pdf
    • http://www.s-prom.si/fileupload/file/dozozifazukusuxuwa.pdf
    • http://itfkarnataka.com/cvsprojects/SSK/Source/2.0.0/images/files/30186656111.pdf
    • http://artsar.pl/userfiles/file/85191271216.pdf
    • http://abwcockeysville.com/uploads/files/30023354038.pdf
    • https://vildmarksjagt.dk/userfiles/file/rojoxupepu.pdf
    • http://zamel2.pl/userfiles/file/21426006034.pdf
    • http://bnblspecialities.com/userfiles/files/42286499752.pdf
    • https://francoisdaulte.com/ckfinder/userfiles/files/72804139666.pdf
    • http://northmarking.com/userfiles/files/gijutovijigegowigep.pdf
    • http://boldogelet.hu/media/18428211838.pdf
    • http://agriturismoilnoceto.com/userfiles/files/6237160603.pdf
    • http://radio-salsa.fr/php/rs/filesupload/file/naxiguni.pdf
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210907_C756EE733747D2C7.pdf
    • https://champion-osk.pl/userfiles/file/21616959925.pdf
    • http://cuanhomkinhtoanthang.com/media/file/6847956082.pdf
    • http://pcccmiennam.com/media/ftp/file/84269223726.pdf
    • https://nabsangram.com/userfiles/file/18446984922.pdf
    • https://krossi.ru/images/content/files/88874142437.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16133565faed5a---4565842062.pdf
    • http://kammed.com/userfiles/file/48560952407.pdf
    • http://oiseau-bleu-morzine.com/userfiles/file/28499578044.pdf
    • http://timebank.ru/sites/default/files/photos/pagefile/wireviserogufelirudugu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=origen+liquido+amniotico+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_off0000d758.bin
f42044a40bfc06bbe2d4bcaeb3a467bf9e29e23fc3d93b74a2432332b27e7359		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD758 19700 bytes
font_01_sfnt_off000109fd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109FD 16792 bytes
font_02_sfnt_off00012214.bin
f4a10ea919eba8282d4820380310bf7b0b563caeb4600ea1c143c7e685a33143		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12214 11064 bytes

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