Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe6cdbebabdea3c9…

MALICIOUS

PDF

75.6 KB Created: 2021-09-24 08:04:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2ebb84b587a58e8c26f99f0f460ed365 SHA-1: cf077c404e2a56e4b8a57249940ecaa39e891fc1 SHA-256: fe6cdbebabdea3c9777d00474ff0e884b737b4afad4dc6638a2ec5e90ff0f5b4
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 trojan. It contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, indicating a phishing or malware distribution attempt. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM further supports this, identifying the PDF as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://infrive.ru/uplcv?utm_term=square+root+of+1.02
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/23514399172.pdf
    • http://mezon.jp/userfiles/file/jodegaxo.pdf
    • http://zgkimsteszew.pl/img/upload/files/3482974844.pdf
    • http://redemaisfarma.com/userfiles/file/puxififebegezivefek.pdf
    • https://weishinclinic.com/uploads/files/202109021412079616.pdf
    • https://tssch.in/tssch/application/admin/uploads/file/14349065325.pdf
    • http://www.seminariomenorvalencia.com/admin/lib/ckfinder/userfiles/files/sigewonurupekusod.pdf
    • https://3eyamaichi.com/upload/ckfinder_temp/files/20210912194903.pdf
    • http://spreewaldpension-luebben.de/meineBilderAlbertGrundschule/file/5593801803.pdf
    • https://bluza-shop.ru/content/File/1589247914.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d42ace94b9---43144741337.pdf
    • http://sartoriaventurini.com/userfiles/files/vewurukegotagafuj.pdf
    • http://studioguatta.it/userfiles/files/fitejuxiselimam.pdf
    • http://yuhongzg.com/d/files/58313808340.pdf
    • http://woodlander.sk/grafika/file/92236073606.pdf
    • http://constantemail.com/userfiles/file/1630690413kufepakaxonexupazovosawo.pdf
    • http://ahlhy.com/uploads/file/140634316159.pdf
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/53195966668.pdf
    • http://denda.co.kr/ckfinder/userfiles/files/76686018957.pdf
    • http://aktien-analyse.de/images/File/47779820296.pdf
    • https://nepoo.ro/app/webroot/files/userfiles/files/65335900082.pdf
    • http://weingut-suppan.at/files/bipozobetofadonuf.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_off0000c4b5.bin
09113c8d3094ea55172500074c74993a670f4359fb5502b99bdf563b223920b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC4B5 17120 bytes
font_01_sfnt_off0000f0d2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D2 16792 bytes
font_02_sfnt_off000108e9.bin
c5160ddd7cee833db3dbbe649473d4ac9c36254526e4123c93cfd43fbbbf7e56		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108E9 10476 bytes

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