Malicious PDF — malware analysis report

Static analysis result for SHA-256 f244b9d6d85bf59d…

MALICIOUS

PDF

60.9 KB Created: 2021-09-25 23:08:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7ba9276efd2ed331ee9fe456946ddf01 SHA-1: 61b601253758906df5ec6a2e9b9e4ab36453b2bf SHA-256: f244b9d6d85bf59dabc1174eb450e5d33764df99b1caff2e638b3ca9ebaaa831
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of 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 for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5774

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.
  • 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
  • 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://crewmak.ru/uplcv?utm_term=manual+gearbox+car+parking+mod+apk+latest+version
    • http://marketingnews.fr/images/file/94444652727.pdf
    • https://sabunwangi.com/contents/files/7453390279.pdf
    • https://mots.alaxarxa.cat/cmsimple/images/file/42405268209.pdf
    • http://evaemlak.com/userfiles/file///raviz.pdf
    • http://nhatrangpalace.net/app/webroot/upload/files/40107128656.pdf
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c719967652---15561864924.pdf
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1614090eb81460---meruzirajogesewu.pdf
    • http://unicaconsultoriarh.com/images/files/79234204640.pdf
    • http://nepalbestcargo.com/userfiles/file/56799351502.pdf
    • https://vishalahospitality.com/ckfinder/userfiles/files/jemizoji.pdf
    • http://lexprikson.com/admin/style/images/userfiles/file/78237959178.pdf
    • https://escolaalfa.com/userfiles/file/182217132.pdf
    • https://konferencii.ru/js/ckfinder/userfiles/files/pogipebofolibimevobawabud.pdf
    • http://lapempi.nl/ckfinder/userfiles/files/76908899392.pdf
    • https://sarna-zapiekanki.pl/ckfinder/userfiles/files/13047436730.pdf
    • http://gma.ge/admin/ckeditor/ckfinder/userfiles/files/84725324841.pdf
    • http://crescentcarpets.com/userfiles/file/51865803249.pdf
    • http://fabtur.ru/upload/files/zaxefekuxuridido.pdf
    • http://abdon.madteam.net/ckfinder/userfiles/files/75115549979.pdf
    • http://mothertheresapublicschool.com/userfiles/file/28830026675.pdf
    • https://picinterior.com/ckfinder/userfiles/files/78902635373.pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b399.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB399 16792 bytes
font_01_sfnt_off0000cbb0.bin
7b6cd50db6ee85d736f5a87e2e568bf744a5e1983a9e930d8683ad5908852da8
pdf-font-stream PDF embedded font (sfnt) at offset 0xCBB0 11352 bytes