Malicious PDF — malware analysis report

Static analysis result for SHA-256 a95b5036b27eed4c…

MALICIOUS

PDF

81.9 KB Created: 2021-09-18 21:12:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1b4c79a61ace9a9082cd6fd2f3ceed40 SHA-1: d6b515ff78b103ff96492275b8bd0699748267d7 SHA-256: a95b5036b27eed4c4c7a5c664438cc7370a2f2a890abda8ffecb3e6764fe60f3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms. Heuristics indicate this is a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://huntic.ru/uplcv?utm_term=wish+grammar+exercises+pdf
    • https://hopadive.cz/ckfinder/userfiles/files/kunotabifumakopon.pdf
    • http://votava2.altrodesign.eu/ckfinder/userfiles/files/fetavorenoveve.pdf
    • http://dui-antidote.net/images/userfiles/file/8984663277.pdf
    • https://bodykneadstherapy.com.au/ckfinder/userfiles/files/51512759494.pdf
    • https://tedvandergulik.nl/userimages/file/47408303903.pdf
    • http://bimbrlata.cz/UserFiles/File/61320026845.pdf
    • http://uts.edu.co/portal/app/ckfinder/userfiles/files/68457862344.pdf
    • https://equinox-e.com/upload/files/76234215194.pdf
    • http://inbeeldt.nl/userfiles/file/nokunakadej.pdf
    • http://euro-ex.net/images/blog/file/kikorawowexir.pdf
    • http://signauction.net/userfiles/file/pevulan.pdf
    • http://flomojapan.com/upload/files/fofijefakexunutuzoza.pdf
    • http://thenikharvconsultancy.com/userfiles/file/salewinurawanuxi.pdf
    • http://biosite.ru/images/news/file/dosubopikizamufi.pdf
    • https://pelletier-tp.fr/ckfinder/userfiles/files/subekimajetokepubet.pdf
    • https://www.thaiahpa.com/flash/files/buvirijovokorovane.pdf
    • https://jakspravnenapsa.cz/userfiles/file/nunimumiwilubawilefakel.pdf
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/kiithto2sgj1gh03g82f586iv8/ribunepefogekek.pdf
    • http://www.mmd.ntou.edu.tw/ckfinder/userfiles/files/66395973449.pdf
    • http://bamor.org/userfiles/file/35559287970.pdf
    • https://cobrawire.com/userfiles/files/rawovisu.pdf
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/xuwexerirotetetudovurix.pdf
    • https://traiteur-troyes-mariage-buffet-aube-10.blaisot-traiteur.fr/ckfinder/userfiles/files/82347889478.pdf
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/c0ba9443cbc8a233ecc10d843e7e3acf/10444900895.pdf
    • http://blossomtour.net/FileData/ckfinder/files/20210910_9E1AA904E8F46DA5.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_off0000d88f.bin
3efeec27728e5ce0240f2981dc9f3631bd151086494f0549cb01a12dce56ac06		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD88F 10796 bytes
font_01_sfnt_off0000f140.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF140 16792 bytes
font_02_sfnt_off00010952.bin
d13802591b8f9abf1ca1fba1585bcf69cc18a31667930ada3a243f6d4fc4af1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10952 18472 bytes

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