Malicious PDF — malware analysis report

Static analysis result for SHA-256 a944747d1711ac61…

MALICIOUS

PDF

71.4 KB Created: 2021-09-25 00:38:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8bd2c9ca37efcdc929607d61704386ee SHA-1: 4438b69dc65dbe3d6f661deafa16e26f98e8f9b0 SHA-256: a944747d1711ac61bba545e944e6ccb5c6747c95b52f30feff4bc3ed7093c90b
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to other PDF files hosted on various domains, indicating a link farm designed to obscure the ultimate destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a tactic for distributing malicious content or phishing.

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://topmebli.com/content/xuploadimages/file/39065288010.pdf
    • http://uptownfallschurch.com/uploads/files/41373947501.pdf
    • https://mmeasar.com/mmeasarfiles/file/9336021952.pdf
    • http://vimar.ua/userfiles/files/18890421720.pdf
    • http://seritour.com/rsm/files/56758135204.pdf
    • https://hsdinstruments.nl/uploads/files/jajozopedaf.pdf
    • http://promocode.lu/userfiles/files/fokegijokaf.pdf
    • http://miyagi.chi-kara.net/Upload/files/febujujul.pdf
    • https://thermaltrailrace.com/imagini_ws/8708170895.pdf
    • http://chinalabware.net/d/files/45329719297.pdf
    • http://phatnang.com/media/ftp/file/labokedemafukikejoluroka.pdf
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/94470785991.pdf
    • http://psystems.gr/Administrator/uploads/userpics/OutPostImages/files/penixozesixogok.pdf
    • http://slsnn.ru/content/file/vuvunanowiduvak.pdf
    • http://de.ruben.pl/ckfinder/userfiles/files/rebudemaxisosinetisono.pdf
    • http://easternhoteljeju.com/FileData/ckfinder/files/20210908_10173E5686A81106.pdf
    • http://kossuthdigisuli.hu/userfiles/file/wunotadabugotubil.pdf
    • https://ngonluathan.vn/images/ckeditor/files/xusep.pdf
    • https://planet-pvc.com/upload/files/91509086722.pdf
    • http://canvangdientu.com/images/file/bonolaligesakatukuvidedu.pdf
    • https://treasurehunterdetectors.com/ckfinder/userfiles/files/vakasexa.pdf
    • http://thaimassageboy.com/ckfinder/userfiles/files/61567905179.pdf
    • https://adikketiga.com/contents/files/ripenopa.pdf
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dokofawon.pdf
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/846fc64bdc91ddcbbc9153d3957506a5/42580821862.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+unlock+android+phone+when+touch+screen+not+working
    • 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_off0000b375.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB375 16792 bytes
font_01_sfnt_off0000cb87.bin
46b1afd0fd1c0d4f0cbf70321c23eb8a9591a68061f8b1fc4f9969b7c1164981		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB87 16548 bytes
font_02_sfnt_off0000f58c.bin
689341b23b657d57b866b9fdb1e8a5882bc294f20fef8c2f10d08a78b31e73b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF58C 11064 bytes

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