Malicious PDF — malware analysis report

Static analysis result for SHA-256 d05490b86391ab21…

MALICIOUS

PDF

84.7 KB Created: 2021-09-12 17:35:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 13419a0f6b08e96e2428111c6894a452 SHA-1: 58c3fdce08f6e6a08b2c6f5bc4932084ab16062a SHA-256: d05490b86391ab21c8ffbebf3d94104fe2c7ccf7ef30c634f0a59644cf28df3e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or redirection scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attack pattern involving directing users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://metrosecuritynepal.com/assets/userfiles/files/44605890810.pdf
    • https://projekt-lesen.de/userfiles/file/jovulazelelijipime.pdf
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/nisujanogaja.pdf
    • https://kaemsp.org/upload/editor/file/xejukakiwixukovaret.pdf
    • http://rld-carbon.ru/file/nitelidizi.pdf
    • http://abwrosedale.com/uploads/files/11640240703.pdf
    • http://robertwestlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fusuzikujakuserori.pdf
    • http://abbwingslynnhaven.com/uploads/files/dupobarewowaxoziriri.pdf
    • https://natinsel.com/imagenes/file/duzenazazasojiwig.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/90eb772a21786bf3eaf335bf8d6bc0b6/dufotezabumijikitilazan.pdf
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/52942924135.pdf
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130cc9b262c9---31201624225.pdf
    • https://genia-groupe.fr/images/files/30814595982.pdf
    • https://bonaparte.cappencms.com/templates/files/92671475021.pdf
    • https://makenie.com/upload/files/zobusirugazeza.pdf
    • https://uleiuri.ro/userfiles/file/bagexoxejedipodumukudilav.pdf
    • http://vektor-bezpeki.com/userfiles/files/66529517477.pdf
    • http://www.udelimpa.es/ckfinder/userfiles/files/27041291956.pdf
    • http://hengfengpaper.com/filespath/files/20210909093214.pdf
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/kogukajizimamaxagubifen.pdf
    • http://av72-reklama.ru/userfiles/file/1630523709c59d618bbb30986c8408.pdf
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/2707949860.pdf
    • http://bluebossa.pl/files/file/36793014117.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=ml+kaneki+injector
    • 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_off0000e83c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE83C 16792 bytes
font_01_sfnt_off0001004e.bin
211fcba88b05b478160a77c7623707b39a405465fcf2cc0c93558bcf7fc71062		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1004E 17812 bytes
font_02_sfnt_off00012e26.bin
5b1e9ffd3aa64b722f8cb434190b50ba8c1f634b968fb38f602498bf32055019		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E26 10272 bytes

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