Malicious PDF — malware analysis report

Static analysis result for SHA-256 caef22b3c93c33c4…

MALICIOUS

PDF

72.1 KB Created: 2021-09-23 15:00:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 1126449804344d8c7d15fd11af0f1b77 SHA-1: 8e24c38aad9fbaa5fdc0d4d8d42fd627da45916d SHA-256: caef22b3c93c33c49aea0d4bda7aab62ac285c6d524f69079695729058f067cd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, a common tactic for phishing or distributing further malware. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggests a malicious purpose related to link manipulation and redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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.
  • 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://crysiq.ru/uplcv?utm_term=mod+apk+real+bike+racing PDF link annotation
    • https://partnermind.cz/images/files/95463634264.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/180335235282.pdfIn PDF document text
    • http://gnatowski.pl/attachments/file/sudolakuler.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/30122488553.pdfIn PDF document text
    • https://ceccarmaramures.ro/userfiles/file/dofulofarid.pdfIn PDF document text
    • http://ichieh.tw/uploads/files/202109210711182314.pdfIn PDF document text
    • https://oferta.lt/i/File/rokaf.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/85948463013.pdfIn PDF document text
    • http://zhatuogz.com/uploadfile/file/jelukirefakiri.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/gemojisokasasume.pdfIn PDF document text
    • http://sarkanyhajo.hu/files/file/72732153598.pdfIn PDF document text
    • http://robbes.nl/media/files/64270216794.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/dusuduxemof.pdfIn PDF document text
    • https://butzbacher.turnpoint.jo/app/webroot/upload/files/vazerafup.pdfIn PDF document text
    • https://llibreriaha.com/img/events/file/guvizis.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/25738111171.pdfIn PDF document text
    • http://kerrya.com/ckfinder/userfiles/files/65730821864.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/63634318858.pdfIn PDF document text
    • http://dga.gr/ILC/img/file/tiranupesurovudarofo.pdfIn PDF document text
    • https://hirurgija.me/files/zugubavumukuradadadoranug.pdfIn PDF document text
    • https://ww150005.linebot.net/upfile/files/20210920050914.pdfIn PDF document text
    • http://enjoy.sk/editor_uploads/system/files/55366078507.pdfIn PDF document text
    • http://fese.in/ienupdimages/images/files/rizejorurofejof.pdfIn PDF document text
    • http://fishingas.com/userfiles/file/36776437126.pdfIn PDF document text
    • http://mitroc.com/userfiles/file/54778556434.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b6e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cefe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEFE 10648 bytes
SHA-256: cea5d93f9231db19254d8bf9f2c19e02720b4dbd185fb92255cdf90e50aacc10
font_02_sfnt_off0000e6f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F2 17256 bytes
SHA-256: 832a55e218240f686b0bd2db2a4c9540d9bc17f0ad3463f7cc6799bceb5ce3ed

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