Malicious PDF — malware analysis report

Static analysis result for SHA-256 4efa269b5fafb90b…

MALICIOUS

PDF

75.1 KB Created: 2021-09-25 03:01:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: da6a486e28b0391191aef6a7fb3645ab SHA-1: 0812dc158f93d6fd432a8e43599c00ef1bc73546 SHA-256: 4efa269b5fafb90b3017c7211124facec335e7364cad0a82e162fb263887baed
134 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains embedded JavaScript and a large number of external URIs, many of which point to disposable hosting. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates it functions as a link farm, likely to distribute phishing content or download further malware. The embedded JavaScript is likely used to facilitate the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://krisoc.ru/uplcv?utm_term=generation+kill+torrent PDF link annotation
    • http://architettosirocco.it/userfiles/files/53486787433.pdfIn PDF document text
    • https://groupburuemas1.com/contents/files/45248749235.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/09/files/210904010457.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bbb7b0354f---62679313195.pdfIn PDF document text
    • http://dgelc.com/userfiles/file/20210925022322.pdfIn PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/59619853511.pdfIn PDF document text
    • http://studioguagnoni.it/userfiles/files/92291201840.pdfIn PDF document text
    • https://pianotuningdarwin.com/userfiles/files/gagevuxegawovuru.pdfIn PDF document text
    • http://architettoangeli.it/userfiles/files/15762704536.pdfIn PDF document text
    • https://comtraining.cl/userfiles/files/gogaluwavofumejikelozifa.pdfIn PDF document text
    • http://cokhihoangvinh.com/uploads/userfiles/file/83704853711.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/pajoxipofuxemader.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/78196776763.pdfIn PDF document text
    • https://woft-dining.com/webroot/editor-uploads/files/pafavamizesunapakumitig.pdfIn PDF document text
    • http://novo-foto.ru/ckfinder/userfiles/files/muwatikuxezokimewub.pdfIn PDF document text
    • http://zeci.nl/im/image/navosiji.pdfIn PDF document text
    • http://nhadep30giay.com/uploads/image/files/39930387850.pdfIn PDF document text
    • https://retrofitoman.com/ckfinder/userfiles/files/7242665551.pdfIn PDF document text
    • https://www.temtechnologies.fr/ckfinder/userfiles/files/tamajepaxebesi.pdfIn PDF document text
    • https://istanbularicilikfestivali.com/upload/ckfinder/files/lajofa.pdfIn PDF document text
    • http://dspec-car.com/js/upload/files/kebusudazuxabawileri.pdfIn PDF document text
    • https://www.totspotdaynursery.co.uk/ckfinder/userfiles/files/75329843252.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bd2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD2B 19744 bytes
SHA-256: 902ab3ebc417f25cad95f50215686fa21c5f8267467229b8d30e6d80526e9bad
font_01_sfnt_off0000f0cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CF 10064 bytes
SHA-256: 407aac0fa5266064685758ebda781d8a05aa90894838d3389e9daf555391fae6
font_02_sfnt_off00010758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10758 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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