Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c120674a3b0ea40…

MALICIOUS

PDF

85.5 KB Created: 2021-09-18 09:32:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7722a20bbdf360aee3e67132b3613864 SHA-1: fb1969997c3982c86b847414a28902c028619a36 SHA-256: 3c120674a3b0ea40bea149fcecd3244021beb6632d3b6a8dc77bce1dff3e0399
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of embedded JavaScript points to its use in executing malicious actions or facilitating the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://inwebjor.ru/uplcv?utm_term=mystery+manor+mod
    • http://ankurgroups.com/userfiles/file/48166988345.pdf
    • http://kaizousha.com/js/upload/files/75454668674.pdf
    • http://staropolski.net/Upload/file/88699397713.pdf
    • http://vinhthuan.com/upload/files/pexifuw.pdf
    • https://ctsgroups.asia/images/file/gejiguwukerolu.pdf
    • http://alwaysshine.com/fileimage/file/zokukusa.pdf
    • https://nmg.lv/img/uploads/files/mejujules.pdf
    • http://ffarchitettura.it/userfiles/files/1439042120.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5cd187ade---25045547619.pdf
    • http://blekinge.boj.se/uploads/userfiles/files/rumetotobotebazoro.pdf
    • http://suaups.net/userfiles/file/40423603575.pdf
    • http://domgr11.ru/uploads/files/nuparikup.pdf
    • http://ibookingkr.com/FileData/ckfinder/files/20210903_281269BEAA3768FE.pdf
    • https://moyaexpresss.com/ckfinder/userfiles/files/35875355308.pdf
    • https://newtop-eg.com/userfiles/file/teninotufik.pdf
    • http://ambvetfanini.eu/userfiles/files/sukigorubexuvef.pdf
    • http://eko-baby.ru/userfiles/file/96870930153.pdf
    • http://mevlanaasm.com/resimler/files/41372971781.pdf
    • http://goldsunjsc.com/upload/files/31855610249.pdf
    • http://gartenbaukoeln.de/uploads/files/87030590627.pdf
    • http://uniondrygoods.com/fckeditor/userfiles/file/nuzibakenotonux.pdf
    • http://agisma.ru/files/pages/files/baxizusivovuxasurogurukuw.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_off0000ec77.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC77 16792 bytes
font_01_sfnt_off00010489.bin
019f52043ee3cff4c512e5ae525cca1ea6c77807955f39530bcf990d20d20c4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10489 17044 bytes
font_02_sfnt_off000130f3.bin
1f6584ae7cbeee3e72e02a2e9255d87c5a29d37a95813f1150dde8f73d59da08		 pdf-font-stream PDF embedded font (sfnt) at offset 0x130F3 10376 bytes

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