Malicious PDF — malware analysis report

Static analysis result for SHA-256 f386452dae7bd51a…

MALICIOUS

PDF

74.9 KB Created: 2021-09-17 06:33:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 369b263061b71df9a7c439f8ef617373 SHA-1: 3222136a7868cf875bd93716a6e70bcc4a553378 SHA-256: f386452dae7bd51a6be4d6d2bec2133a9584d8cf092ccba17318ab0a47cbacc1
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 pointing to various domains, suggesting it functions as a link farm or redirector. The presence of 'utm_term' parameters in some URLs indicates a potential phishing or spam campaign aimed at driving traffic to specific content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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=12+inch+led+tv+price+in+pakistan
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/roboriwudagiponudex.pdf
    • https://rajatotogroup4.com/contents/files/xodozikipizibofofalaka.pdf
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/8d3f88292a7d7199f2e832f87c58550b/49975116826.pdf
    • https://www.hkfew.org.hk/ckfinder/userfiles/files/75813936880.pdf
    • http://mercuresamuichaweng.com/admin/file/37047029469.pdf
    • http://evpltravel.com/xv_image/file/vibadageduruzufobel.pdf
    • https://rimsball.com/ckfinder/userfiles/files/60494000164.pdf
    • http://masonhn.com/d/files/kizofofi.pdf
    • http://batistar.fr/userfiles/file/nekuluwa.pdf
    • https://garnizone.com/userfiles/file/26703244420.pdf
    • http://15441707.com/data/board/file/20210915205043.pdf
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe7eb5afd9---zixafetaw.pdf
    • http://gmei.lt/ckfinder/userfiles/files/86760702590.pdf
    • http://xn--b1agaa2anfqdp.xn--p1ai/ckfinder/userfiles/files/54000593299.pdf
    • https://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/66141043317.pdf
    • http://elrey-uslugi.ru/media/file/5695685834.pdf
    • http://www.gonouvellezelande.com/files/divenebatumama.pdf
    • http://tpdw.pl/userfiles/file/nureni.pdf
    • http://altadirezione-consulting.it/userfiles/files/13551532248.pdf
    • https://shastriratanchatterjee.com/ckfinder/userfiles/files/94921613256.pdf
    • https://next-engineering.com/userfiles/files/bapalukinukasuji.pdf
    • https://paroles-vives.com/ckfinder/userfiles/files/zusuwetiboduwesufa.pdf
    • http://nissanotogovap.net/uploads/images/files/62289298370.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_off0000bdd1.bin
341b5617941dfee75b2ab3198812c71af843b66f36559e98d432239c4ea01f9f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBDD1 10724 bytes
font_01_sfnt_off0000d670.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD670 16792 bytes
font_02_sfnt_off0000ee82.bin
d82094df0d5afe3c535f7f3afdcb3fa9ed684cb4619936a28583c481240ab202		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE82 18144 bytes

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