Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ba726f62e664a83…

MALICIOUS

PDF

99.7 KB Created: 2021-09-20 22:34:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6f5717fd15f0244060d34c363cf61d1e SHA-1: f4dfb30e53a670bbd8d3bbd3be360ba3449f0fe3 SHA-256: 0ba726f62e664a837383ae245f8cfe74db0c96a007879ae193ed8dc39086d0f3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also exhibits characteristics of a link farm, with numerous external URIs pointing to various domains, suggesting an attempt to obscure the ultimate destination or distribute payloads. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://tufaghanafc.com/js/ckfinder/userfiles/files/41781851625.pdf
    • https://habibitours.com/ckfinder/userfiles/files/58437760009.pdf
    • http://hyundaiokla.com/uploads/files/gisavilajusijut.pdf
    • https://zerling.eu/nico/images/files/17368936560.pdf
    • http://christopherspubandgrille.com/userfiles/files/xinifivevamigu.pdf
    • http://yasairamenbar.com/uploads/files/kopegitilikegegutenozefak.pdf
    • http://boek.se/bilder_umeny/File/vumad.pdf
    • https://evrenmentese.com/upload/ckfinder/files/lipinasobubugalupaf.pdf
    • http://sportingclubalbinia.eu/userfiles/files/mosinurigonakasudomugu.pdf
    • http://www.jobsincrete.gr/images/_user_na/file/podirumobupiziferedu.pdf
    • http://bsp-oblspl.org/ckfinder/userfiles/files/9840238646.pdf
    • https://calprin.com/ckfinder/userfiles/files/79345873835.pdf
    • https://promenade-perpignan.com/userfiles/file/98196846778.pdf
    • https://mimpishio2.com/contents/files/pizunibozatikowifupobuves.pdf
    • http://ocung.net/img/files/tebumuliwukuzewejiras.pdf
    • http://austria-ex.com/images/blog/file/jiwikajuxomakizolijuzuma.pdf
    • http://pscemetery.com/userfiles/file/zivufevogovodokaxibobewe.pdf
    • http://datong-travel.tw/upload/ckeditor/files/20210920060233.pdf
    • http://alcantara.cz/data/file/63477438935.pdf
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/duvulifupidafi.pdf
    • http://textingrights.com/userfiles/files/60398635111.pdf
    • https://brigitte-farner.ch/userfiles/files/subejabetogujurivupox.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=signals+and+systems+by+nagoor+kani+ebook
    • 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_off00011d9a.bin
fd8287c2c5b7e5265ea3c0b4e20e64a1be6aaa7926befc7f99e48e52902deb69		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D9A 11012 bytes
font_01_sfnt_off000136fb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x136FB 16792 bytes
font_02_sfnt_off00014f0d.bin
3eca2a6df6ccb7f72a08f4243ea432e27da3e9d6e4f9e1528c267c0048349b19		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14F0D 19024 bytes

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