Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d6ba393c6341cd2…

MALICIOUS

PDF

76.8 KB Created: 2021-09-08 17:15:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 14458f6f6eb0c13881ef7bcd1df0909d SHA-1: 26d8055c09975a871aa3c34bae8e6764f025d71c SHA-256: 6d6ba393c6341cd250bf4bf86711453683788701e8dc87c6f185589237415066
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. The document contains numerous external URIs and embedded links, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users to potentially malicious content. The primary attack pattern involves luring users with search-term-like URLs, likely to trick them into downloading further malicious payloads or visiting phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://infrive.ru/uplcv?utm_term=psychological+testing+anne+anastasi+pdf+free+download PDF link annotation
    • https://lorus.rs/files/zusudup.pdfIn PDF document text
    • http://viettelhaiphong.me/data/dulieu/files/42839909393.pdfIn PDF document text
    • http://americasbestmanassas.com/uploads/files/27011180197.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161356e175dbe4---rodepepulitovokadatag.pdfIn PDF document text
    • http://thewesternmist.com/userfiles/file/linelirogij.pdfIn PDF document text
    • https://webshopplus.nl/app/webroot/files/userfiles/files/palakalosuxukepafoba.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/pikesarom.pdfIn PDF document text
    • http://kesherisrael.com/uploadEditor/files/muniguzovubokikigoxedapa.pdfIn PDF document text
    • https://pieseautocomenzi.ro/userfiles/file/diwebil.pdfIn PDF document text
    • http://eco-building.cz/UserFiles/File/zuxoposa.pdfIn PDF document text
    • http://goghepcacloai.com/media/ftp/file/57920782779.pdfIn PDF document text
    • https://heureka-cz.eu/files/xowizofuxaxiwenefafa.pdfIn PDF document text
    • https://www.agcontraincendios.es/ckfinder/userfiles/files/24645011769.pdfIn PDF document text
    • http://omeofest.eu/userfiles/files/fovupisoriwawerawob.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/tajogaxok.pdfIn PDF document text
    • https://sealordhotels.com/ckfinder/userfiles/files/nerutubobezulebevafukova.pdfIn PDF document text
    • http://eros-arena.com/eros/userfiles/file/92604854995.pdfIn PDF document text
    • https://kattliv.com/kattliv/admin/userfiles/file/9522852672.pdfIn PDF document text
    • http://popmetre.com/news/files/78100149497.pdfIn PDF document text
    • http://daglichtfilters.nl/ckfinder/userfiles/files/54270163956.pdfIn PDF document text
    • http://antitumor.org/filespath/files/20210905203310.pdfIn PDF document text
    • http://thibangoto.com/app/webroot/uploads/files/20827515763.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_off0000c455.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC455 11100 bytes
SHA-256: 5ddb8e956babb3e128a232afb1aa635a95a5c595c5923725183a86194c7524af
font_01_sfnt_off0000de0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE0D 18160 bytes
SHA-256: d1ac3341863c2c1cf2e240b54addc0879ede1c657b8859d59ec0aaf34ece04ec
font_02_sfnt_off00010d5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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