Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e212958b9dd8d8b…

MALICIOUS

PDF

80.8 KB Created: 2021-09-18 18:20:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b935bb203d0d528cdac87e75b7f7e210 SHA-1: 8cf53b251b5390cd95f2201f145a92a13709296c SHA-256: 9e212958b9dd8d8ba1a23aa91413539de9cef8036b15eee0de8575ee5ed87f0f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for malicious PDFs to execute code. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm on disposable hosting, with numerous URLs pointing to PDF files. One of the extracted URLs, 'https://garglob.ru/uplcv?utm_term=download+brute+force+attack+apk', suggests a lure related to downloading tools, likely to trick users into downloading malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://garglob.ru/uplcv?utm_term=download+brute+force+attack+apk
    • http://detskypohar.cz/upload/file/kuxof.pdf
    • https://bepxuyenviet.com/upload/files/tufavidijito.pdf
    • http://www.vinoplaza.nl/img/upload/files/38179830937.pdf
    • http://k3projekt.pl/uploads/userfiles/files/bubawizedirin.pdf
    • https://sluganarodu.org/userfiles/files/mokexadavovadidamen.pdf
    • https://rowadalbyt.com/userfiles/files/nupid.pdf
    • http://kxxbs.com/uploadfiles/file/a/wutel.pdf
    • http://e-instar.com/userfiles/file/kixilawoku.pdf
    • http://clinicaveterinariabilancino.it/userfiles/files/kepulutiraxi.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b896d936be---83409855515.pdf
    • http://biosite.ru/images/news/file/gakuvukezuvubanotosuziti.pdf
    • http://oreade-breche.fr/userfiles/file/25470122379.pdf
    • http://machi-tomo.xyz/js/ckfinder/userfiles/files/59770827023.pdf
    • https://copperscrap.wasteequipment.net/ckfinder/userfiles/files/tivixowimajel.pdf
    • https://www.xyoaa.org/sites/default/files/files/vegogitegobopolomutipure.pdf
    • http://www.astmalek.cz/obrazky/file/vuwixurumugaranazosemela.pdf
    • http://gameadvisers.com/js/new/fckeditor/userfiles/file/dojivomi.pdf
    • https://profm.hu/files/file/mumowoka.pdf
    • https://macintosh-szerviz-javitas.nuttydog.hu/ckfinder/userfiles/files/xifesimakep.pdf
    • http://sgpeo.pl/users/file/40081308934.pdf
    • http://hanahana.vn/media/ftp/file/pafusigawakurafuvuxuwevir.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_off0000d548.bin
f46d2445484fa8c5b86ca07b462d9ed0cdaa3ac47c13fcb2b683940567dc023d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD548 18564 bytes
font_01_sfnt_off0001050c.bin
8fae81a1a8a02c198810f4728158e2b23aa600152430e204a0cdae36eded30ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1050C 10772 bytes
font_02_sfnt_off00011dda.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11DDA 16792 bytes

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