Malicious PDF — malware analysis report

Static analysis result for SHA-256 fce766bc28ec866c…

MALICIOUS

PDF

78.4 KB Created: 2021-09-18 07:48:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a9d5682ff77cf1d3458c8b8c4b52ce39 SHA-1: ee001ac7a9b51c1dcd1ee9aaf369cab025ab2a88 SHA-256: fce766bc28ec866cb37f122547381512b75a44094ae79b12d4bfaf3b3fa0fe50
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, including one that appears to be a redirector with UTM parameters, suggesting a phishing or malware distribution lure. The PDF structure and embedded links point towards a tactic of directing users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://crewmak.ru/uplcv?utm_term=free+transfer+from+android+to+iphone
    • http://kiko168.com/UploadFile/file/20210907134920643.pdf
    • http://studioprogettoarchitettura.eu/userfiles/files/dosek.pdf
    • http://unitedpetexpress.unitedreloth.com/ckfinder/userfiles/files/jaxigitadixumusigawinan.pdf
    • http://daisytalavera.com/userfiles/files/vapagerezet.pdf
    • https://suma.ca/upload/editor/file/66093427997.pdf
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/nc46d79e7almeu3t2an7glimq2/66179227008.pdf
    • http://www.tramag.pl/upload/file/15185807899.pdf
    • http://guss-ex.de/uploads/fck/file/sigaj.pdf
    • http://1mosref.ru/ckfinder/userfiles/files/tifejakowituvex.pdf
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/2s207ljl2nu7s88icrmhsknh60/33374906776.pdf
    • http://madveras.com/ckfinder/userfiles/files/95867977301.pdf
    • http://ingpiazza.eu/userfiles/files/vigedusitibidut.pdf
    • http://xn--o79av69abka850ab6c.com/upload/file/202109181115101621.pdf
    • http://thelifelesson.net/home/tappingchanges/public_html/dowalumniusa/ckfinder/userfiles/files/66318548562.pdf
    • http://pizzeriagiganti.ro/imagini_ws/nozuxujip.pdf
    • http://texmet.pl/userimages/file/25750487757.pdf
    • http://spc1991.com/ckfinder/userfiles/files/46877083899.pdf
    • http://leebyenghun.com/new/upload/board/files/rizinavapimurazakoletum.pdf
    • http://www.weilandensemble.nl/ckfinder/userfiles/files/lasiserifo.pdf
    • https://yasacompany.com/upload/files/turufexanotuzos.pdf
    • http://leasingtowers.com/ckfinder/userfiles/files/90574907329.pdf
    • http://mustang.tom.ru/jsplugins/ckfinder/userfiles/files/96372051008.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_off0000cde0.bin
1f80305d09a1d7bd1d59b0ddcbbc963a935051665294e668bd948f5cfca4fef6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCDE0 10696 bytes
font_01_sfnt_off0000e628.bin
617d9e035a6103ed0bd91c212fadb1699bbdfda485de2c88d84a9a8ff6c8c81d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE628 17680 bytes
font_02_sfnt_off000113a3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x113A3 16792 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.