Malicious PDF — malware analysis report

Static analysis result for SHA-256 09e6ff21219f63f0…

MALICIOUS

PDF

72.9 KB Created: 2021-09-24 17:18:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 67dd090d9414ee77348e2c4aa24a6f3d SHA-1: d6e18cc22538997f404f23369ba488f3fcd3c516 SHA-256: 09e6ff21219f63f061ffdaaf5eb6b788fe765f22460a26aa9335cb3d3b5650c4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan by ClamAV. It contains numerous embedded URLs pointing to various domains, suggesting a link farm or redirection mechanism to host malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using disposable hosting for these links, further supporting a malicious intent.

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://oniceh.ru/uplcv?utm_term=marathi+kadambari+pdf+free+download
    • http://dekobonner.de/userfiles/file/jumegevogor.pdf
    • http://clinicaveterinariagussago.com/userfiles/files/kodopaxiwuv.pdf
    • http://inggeo.eu/userfiles/files/3717162082.pdf
    • http://quatanggiabao.com/images/uploads/files/63329179742.pdf
    • http://karat-dobremiasto.pl/userfiles/file/78682020415.pdf
    • https://flyags.com/editorResources/file///34754441872.pdf
    • https://mmtours.si/uploads/kimakujejokuz.pdf
    • http://imhome-listings.com/userfiles/files/87202967228.pdf
    • http://phupmirpol.pl/userfiles/file/duwubumufamagomev.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147e952e0e7f---zexigolufutixavi.pdf
    • http://fantalife.nl/userfiles/file/66285369365.pdf
    • https://juvelyrikoscentras.lt/Files/file/zivatutuvuzegoxatokemu.pdf
    • http://tpdw.pl/userfiles/file/70064630705.pdf
    • https://sinarwaja.com/account/files/zuwekamiposijejajiduwe.pdf
    • http://ccadl.com/files/20210923225422.pdf
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3f1b669f5---56472738579.pdf
    • https://majubesar.info/contents/files/27832788347.pdf
    • https://cottingham-group.com/cufiles/files/gavavefulilofadadaxa.pdf
    • http://mobil-tech.com/files/94569597576.pdf
    • http://105chers.netsociality.com/upload/files/kirokugaweg.pdf
    • http://systemsbiology.at/uploads/assets/file/80744566854.pdf
    • http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/mowurave.pdf
    • http://campingwithconvenience.com/files/files/wefiduwoberur.pdf
    • http://www.keizerco.nl/userFiles/file/nitexufokuzudobifokod.pdf
    • http://shrlie.com/upload_fck/file/2021-9-19/20210919225840107897.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_off0000b535.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB535 16792 bytes
font_01_sfnt_off0000cd4c.bin
1dab3659c15542686c51dee297d97c25c7fb2f98f7dcfffde0904362b5c0b9a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD4C 10904 bytes
font_02_sfnt_off0000e622.bin
fbdf979863fe855431b54be9502bb03c0c139e0c2f28f1aaa95c5bee7e30a7c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE622 18960 bytes

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