Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e9d35b046531aa8…

MALICIOUS

PDF

71.5 KB Created: 2021-09-27 21:55:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 47688850747cb2376681529ca144464a SHA-1: 72f929f7df36cf15e0a8601870ae00230811683f SHA-256: 6e9d35b046531aa8c34ad6fb818849a67009ac1d5edaf21a321c51fe0f8798cf
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or initiating malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://laborke.ru/uplcv?utm_term=granny+mod+menu+outwitt+download+ios
    • http://www.biharikft.hu/bihari-admin/ckfinder/userfiles/files/14298481734.pdf
    • http://aluminial.pnh.pt/js/ckfinder/userfiles/files/51819551484.pdf
    • http://leeharringtonhomes.com/userfiles/file/rifizu.pdf
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/8a14b0a966e70f8fab6d4c40c54b8291/nusaweseno.pdf
    • http://aal.tw/uploads/htmlupload/files/64344098140.pdf
    • http://triple-a.co.th/ckfinder/userfiles/files/45805455698.pdf
    • http://jedzenie365.pl/ckfinder/userfiles/files/35811553502.pdf
    • http://lacasedescaraibes.fr/file/rupagejuxebokuvanupogoz.pdf
    • http://bresky.cz/res/file/44345020836.pdf
    • https://gcr.goldcrownresort.com/magazine_files/files/xisebawulameduf.pdf
    • http://toyotarent.kr/FileData/ckfinder/files/20210907_E70C21714C837689.pdf
    • http://bronnicy.inhome360.ru/admin/ckfinder/userfiles/files/20552035011.pdf
    • https://alkirbilaw.com/userfiles/files/wutaselodifuganu.pdf
    • https://eltonltd.ru/sites/default/files/uploads/24222056605.pdf
    • http://ambvetesopo.eu/userfiles/files/saledirederajuxixejusika.pdf
    • https://cardolf.ro/files/mubazusigopefar.pdf
    • https://minlinart.com/archive/upload/files/24971583223.pdf
    • https://www.agencesramos.com/ckfinder/userfiles/files/puzijubusobividalu.pdf
    • http://tiquital.com/documentos/file/noludutoxo.pdf
    • http://nanopena.cz/upload/file/gisizawawa.pdf
    • http://gestioniarmatoriali.it/dugedevonu.pdf
    • https://hiroyoung.com/data/files/38751525159.pdf
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/lpb29o74o5dpdsbk5p49rtjjs7/togunizadigazegodifiwakum.pdf
    • http://kuhomania.ru/ckfinder/userfiles/files/10323086936.pdf
    • http://terredellamagnagrecia.com/userfiles/files/dapedukiziv.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_off0000b43f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB43F 16792 bytes
font_01_sfnt_off0000cc56.bin
3ebe25656ade9c22e9062b9a151e27bf81ee62528204fa2df61f863bcd44f5a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC56 10748 bytes
font_02_sfnt_off0000e520.bin
14a5c3868ff9864806a1e210588f6fbe1dd4e5febee1cf54decf7c396b86a6c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE520 16636 bytes

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