Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c00e104e74e3214…

MALICIOUS

PDF

85.5 KB Created: 2021-09-18 01:01:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ccb179d6b2c468475f9e5a85987a3d6b SHA-1: 926d4d4b63f51239968a4844d99dd02b3758bfd7 SHA-256: 6c00e104e74e32141ecffdd7709a2f3555e88c8618cf4469ead0a7c0941b0cbd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, suggesting an attempt to lure users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a strategy to obscure the true malicious destination through a large number of redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://cructi.ru/uplcv?utm_term=minecraft+windows+10+hacks+2020
    • http://ssatripoli.org/userfiles/file/9658395911.pdf
    • https://lose-weight.tw/upload/files/zotejiporevugavomuto.pdf
    • http://thermogroup.ru/uploads/files/48027814174.pdf
    • http://www.biogreeno.com/cms/ckfinder/userfiles/files/95390324227.pdf
    • https://chetanaus.org/bheru/uploadfiles/file/26897360755.pdf
    • http://labsshop.com/d/files/dizitipazaruxuz.pdf
    • https://aquafilling.com/userfiles/file/vovojonunosawobizisukig.pdf
    • http://vvk-wiedermann.at/userfiles/file/82579659046.pdf
    • http://eau-msu.ru/ckfinder/userfiles/files/lanenafawapane.pdf
    • http://www.leasebridge.com/CKUPimg/files/38069812868.pdf
    • http://naoshima-habitant.com/images/blog/file/35888532201.pdf
    • http://zagazzo.com/userfiles/file/migetanizepuji.pdf
    • http://marinapogon.pl/upload/file/wurewawureniwatadinu.pdf
    • http://ubest.ru/images/file/lijisoxeka.pdf
    • https://ezsprinting.com/userfiles/file/numanubozen.pdf
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613748ff30f5f---sawew.pdf
    • http://danieldesignpro.com/userfiles/87920011249.pdf
    • http://ippon.lv/uploads/File/98598840201.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135537832411---20162360408.pdf
    • https://mkontakt.com/dat/file/28664092498.pdf
    • https://vialivonica.eu/userfiles/files/vejatew.pdf
    • http://findingthegrey.com/userfiles/file/dudigakiba.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_off0000e8a9.bin
230b9608243cec52144a8a913970fed00aca9168a852eaa5efc360567f87beb9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A9 10992 bytes
font_01_sfnt_off00010255.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10255 16792 bytes
font_02_sfnt_off00011a67.bin
134e374d18336d2b63061d43d4275ec1d24dd8d6693316f8beaa64db06584326		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A67 17928 bytes

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