Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccc4ff00ae4b642f…

MALICIOUS

PDF

81.5 KB Created: 2021-09-16 11:47:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c9307e288b26f2483acaae0e54c8f844 SHA-1: c5264bfe685dcd2d9c102762d4c514f5aa150710 SHA-256: ccc4ff00ae4b642f9169a40ff51bb2d798827d0d45df417cd368a5d19878979e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and are used in a link farm pattern, suggesting an attempt to distribute malicious content or conduct phishing. The heuristic 'SE_URGENCY_LURE' indicates the document likely uses urgent language to prompt user interaction.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=thunder+vpn+fast
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130f7039e868---64530740954.pdf
    • https://ktmcollege.org/public_html/userfiles/file/vusopavozuberoj.pdf
    • http://tongchangkj.com/uploadfile/file///2021090615040136.pdf
    • http://ckattorneys.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gukuvolofit.pdf
    • http://ozdesignhouse.com/app/webroot/uploads/files/83894858117.pdf
    • http://concilianavarra.com/userfiles/files/gadakazematixixokarezebaj.pdf
    • http://palami.by/images/file/luvijagamiluba.pdf
    • https://jager-ig.tw/up_photo/file/78644680578.pdf
    • https://infypos.com/infyposcms/media/rodujuzi.pdf
    • http://yas-center.ru/userfiles/file/42828978363.pdf
    • https://wineart.online/userfiles/file/29898770260.pdf
    • http://volker-issmer.de/userfiles/file/gemasotuboboti.pdf
    • http://manavpublicschool.org/manav/userfiles/file/virolefozunozab.pdf
    • https://netron.pt/app/webroot/media/files/wavadede.pdf
    • http://safiorida.dk/operatori/userfiles/file/vijisezufarigibelad.pdf
    • http://taiwan-tsai.com/upload/files/tewosukosiwuj.pdf
    • http://www.saito-ken.jp/userdata/file/tasinapixavew.pdf
    • http://noahmission.org/dataroom/file/fugipipake.pdf
    • http://solarexperten.ch/fckeditor/editor/images/file/27289093534.pdf
    • http://op-gold.com/ck_image/files/30146987141.pdf
    • http://damnoen.com/ckfinder/pho/files/35182804594.pdf
    • http://lamexmarket.com/uploads/files/xisagawajugaj.pdf
    • http://halmar.info/userfiles/file/vesim.pdf
    • https://rt9.rspo.org/ckfinder/userfiles/files/44022423782.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_off0000d9a3.bin
6a372083b55cbff1ade5f09f4b5aad7a2b1787c482694b179a6bd49f467cc1e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A3 10464 bytes
font_01_sfnt_off0000f153.bin
cf951c680ab97f13d224ff6fa4fcd340ba3016e6327f7290da1efdeeace302d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF153 17924 bytes
font_02_sfnt_off00012045.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12045 16792 bytes

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