Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca164c09362d9262…

MALICIOUS

PDF

71.3 KB Created: 2021-09-27 08:34:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 89d22742743d6771710f36f620d7a39a SHA-1: 4e96846bddf67e243718610322d3ff43b85a1507 SHA-256: ca164c09362d92627c82374d66be3e9006d18de46f95eb50badb0bd9cdcaadd0
134 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 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 0.9837

Heuristics 6

  • 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.
  • 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 http://tiendanatacion.com/noticias/files/sabiv.pdf
    • https://himarco.ir/basefile/himarcoir/files/ximomojuwovurogomumosakat.pdf
    • http://cuatro-pr.org/sites/default/files/file/xepemulami.pdf
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/85476844134.pdf
    • https://regaluxiluminacion.com/uploads/assets/file/49048020330.pdf
    • https://monographie.com/ckfinder/userfiles/files/zetepigisava.pdf
    • https://rotitelor.com/contents/files/batakoxobowiwilegeminoj.pdf
    • http://burattinojatek.hu/userfiles/file/64465441631.pdf
    • http://mgocsm.in/userfiles/file/tegivilavotumaridanutopo.pdf
    • https://taipeitccia.org/CKEdit/upload/files/jenakaguferem.pdf
    • http://dom-2000.ru/ckfinder/userfiles/files/xexugurexu.pdf
    • http://tk-weld.com/images/library/File/rejiserab.pdf
    • http://cck-brno.cz/ckfinder/userfiles/files/lajupusevizitesafaxale.pdf
    • http://medrea.ru/upload/files/5230976341.pdf
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/4ec614399a4160e4a0e9e576b598ffa0/nazububelisoxibuf.pdf
    • http://2m-m.eu/userfiles/files/pomudizawiz.pdf
    • http://gold-carsales.com/js/upload/files/98056710718.pdf
    • http://clinicaveterinariacene.com/userfiles/files/15918731414.pdf
    • https://garnet-medical.com/userfiles/files/41089363011.pdf
    • http://allivecoat.com/userData/board/file/76711808606.pdf
    • http://dagmar-e.de/userfiles/file/4544043644.pdf
    • http://administratieindex.nl/images/uploads/61825234155.pdf
    • http://tg-focus.ru/userfiles/files/nenigedakim.pdf
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/0837001302319278c6c149294ee6f748/94166593749.pdf
    • https://www.multilandtours.com/assets/ckfinder/userfiles/files/7194789047.pdf
    • http://dainindo.com/Uploads/userfiles/files/jatojidebulewowonezugeta.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=unlock+an+android+phone+without+password
    • http://s292376414.onlinehome.fr/datas/imgmail/file/malorogapelivupezo.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_off0000b383.bin
55b6795dea14c106be990a77536a588d0d4d3562fc699ffd05a3ec4cbdccb965
pdf-font-stream PDF embedded font (sfnt) at offset 0xB383 16736 bytes
font_01_sfnt_off0000de18.bin
d199b2d9d1cce5aa49ec93db1cc26168e263e4202a697f1b99e675e9d046882f
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE18 10896 bytes
font_02_sfnt_off0000f750.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF750 16792 bytes