Malicious PDF — malware analysis report

Static analysis result for SHA-256 011dea6e4c39f4b3…

MALICIOUS

PDF

75.6 KB Created: 2021-09-14 00:50:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9ca77f2af7fa54943f48be36ed1116da SHA-1: b6b69d6f3feb22f2557a9da255c970ba0570d1fb SHA-256: 011dea6e4c39f4b3bb73ec5a4a70936d6ed646609612026528cbe93b82e9760e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to suspicious domains and are part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document, likely leveraging T1059.007 if any JavaScript was present but not detailed.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://deesudcoolingtower.com/userfiles/file/49713492668.pdf
    • https://bharatceramics.in/ckfinder/userfiles/files/tubolenuxubofaxoze.pdf
    • http://studiobonvino.com/userfiles/files/48381398114.pdf
    • http://www.louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/62636679151.pdf
    • http://tianlanlawyer.com/filespath/files/20210912100307.pdf
    • http://paddockj.com/user_data/editor/ckfinder/core/connector/php/upload/files/zameradaga.pdf
    • http://kartelabasligi.com/images_upload/files/jutejupinikasalibesuwave.pdf
    • http://huucodatlanh.com/userfiles/file/99834020516.pdf
    • http://bargiel.com.pl/ckfinder/userfiles/files/nagijusirewokavodut.pdf
    • http://stellar.ru/ckfinder/userfiles/files/zufipilotugesakarunivox.pdf
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/32237401362.pdf
    • http://secondhandgraphics.com/usrfiles/file/sititexejezorikurepipomas.pdf
    • http://lustigersteirer.at/userfiles/file/50904505053.pdf
    • https://gea99.com/ckfinder/userfiles/files/lifido.pdf
    • http://jump360.co/upload/files/20210904075031.pdf
    • http://www.corazondelsol.es/ckfinder/userfiles/files/vodexudumigirofevotakete.pdf
    • http://lingeriedediva.com/UploadFile/file/2021090714150873499.pdf
    • http://heatexchangersolution.com/upload_fck/file/2021-9-5/20210905210528524931.pdf
    • https://relans-nn.ru/images/docs/file/gajiwetet.pdf
    • http://madiran-cruduparadis.fr/ckfinder/userfiles/files/pesavemirudotupapazolu.pdf
    • http://kxqcgs.net/filespath/files/20210914054522.pdf
    • http://gtlitalia.com/userfiles/files/zuloju.pdf
    • http://nexxstep.nl/userfiles/file/7978683981.pdf
    • http://savvyais.com/userfiles/file/tesakutaw.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=watch+hitman+wife+bodyguard
    • 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_off0000be0a.bin
947b1395976fef35c4f7cb223a3d0b836664dd8c24dc562f4cb590e70a05391f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBE0A 18640 bytes
font_01_sfnt_off0000edcd.bin
3ca3e2724f844a95051f54ef6ae328e42d79a8bb37bc66d1f5dadd6739e86c2c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCD 11144 bytes
font_02_sfnt_off00010780.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10780 16792 bytes

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