Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6de5ac674ab7fcf…

MALICIOUS

PDF

83.1 KB Created: 2021-09-13 18:19:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b98b3b47b588561d868361ce32668191 SHA-1: aff1c4b30a8942f03bf3d5cbc260eebf6b9b6af5 SHA-256: e6de5ac674ab7fcf4f77524b288a0ac74039b8db98fcf2774b6c595fb48ad1af
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains a large number of embedded URLs, many of which point to disposable hosting and are structured as link farms, suggesting a phishing or malware distribution campaign. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://medvor.ru/uplcv?utm_term=game+bus+simulator+ultimate
    • https://vico-immobilien.com/ckfinder/userfiles/files/vugubulibufelelakabetojak.pdf
    • http://progettogeometra.it/userfiles/files/walepufebeposav.pdf
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/1a0bca2cdfb379b1830c5e38d555f9a4/13652801844.pdf
    • https://12waktu.com/contents/files/kamixefefafexomegodar.pdf
    • http://hizirferforje.com/admin/fckeditor/editor/images/file/gewezevidakulotoruxeduxom.pdf
    • https://anninhsieuthi.online/upload/files/mevigimusefuxa.pdf
    • https://oykufestivali.com/ckfinder/userfiles/files/85856392551.pdf
    • http://chia4kids.ru/ckfinder/userfiles/files/lonuta.pdf
    • http://sinhorelli.com/userfiles/file/98042452170.pdf
    • https://slide-bearing.com/d/files/siberezutosozobipop.pdf
    • https://gretajensen.com/ckfinder/userfiles/files/fesubojelesatepuluze.pdf
    • http://jinsonmetal.com/Upload/file/vobesi.pdf
    • http://ifa-astrologie.de/userfiles/file/44364315962.pdf
    • http://agecarekorea.com/ckupload/files/57174928310.pdf
    • https://h16hr15k-h19hr37urn.com/contents/files/sapobojurugarud.pdf
    • http://riverside-plaza.com/upload/userfile/files/41094435689.pdf
    • https://orangcar.com/app/webroot/upload/files/zevepan.pdf
    • http://www.ecrivains-consult.fr/easyonline/ckfinder/userfiles/files/nazikisojusekagurotej.pdf
    • http://studiocalderini.it/userfiles/files/pawabololanijodilupu.pdf
    • https://mn-lawfirm.com/box/userfiles/file/85776793074.pdf
    • http://xn----7sbezcba9a5aggb3j.xn--p1ai/ckfinder/userfiles/files/sobuxiwolet.pdf
    • http://linklandhotels.com/upfile/editor/files/jixiliwase.pdf
    • http://macierz-grodziec.org/files/file/8838406671.pdf
    • http://www.grupoaccs.net/ckfinder/userfiles/files/zixamewoleselo.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_off0000e3db.bin
684b250c5d83398c37dcf62d35c73afb63da25baf91337b21f3f78967af1bea1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3DB 10444 bytes
font_01_sfnt_off0000fb95.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB95 16792 bytes
font_02_sfnt_off000113a7.bin
3717f2d9b3a117b9799280b21fb2b397850da03ae14ff1ae66084a6dfeb629c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x113A7 16528 bytes

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