Malicious PDF — malware analysis report

Static analysis result for SHA-256 31a906807c5dc212…

MALICIOUS

PDF

86.8 KB Created: 2021-09-19 08:35:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 353ef5c57b323ac8efc1f421dc947d6f SHA-1: 642ae3ad4dac574437d9c11b15c5ececedce0c9b SHA-256: 31a906807c5dc212c528aacae616fbed6e2343001c36908a0b25fe3bc273895a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The presence of numerous external links, many pointing to potentially disposable domains, suggests a phishing or credential harvesting attempt, or a lure to download a second-stage payload. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/291860577613f2d15b4005.pdf
    • http://www.hgbehringer.de/img/files/files/23337967034.pdf
    • http://hwangtosidae.com/userData/ebizro_board/file/44682222996.pdf
    • https://tonwen.org/userfiles/file/rigufabopufojalabidenew.pdf
    • http://tamtamphat.com/upload/files/83828182029.pdf
    • http://www.kigimex.com.vn/ckfinder/userfiles/files/13606283680.pdf
    • http://www.performhabitat.fr/bundles/astadmin/js/ckfinder/userfiles/files/dusap.pdf
    • http://namlinhchisapa.com/userfiles/image/file/rowixamoverafotezodag.pdf
    • http://szkolaprzybranowo.pl/ckfinder/userfiles/files/17955898896.pdf
    • http://biondiairsystem.it/userfiles/files/38438605818.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613449a383f09---18967245074.pdf
    • http://euroteam.vn/ckfinder/userfiles/files/28618715986.pdf
    • https://baruipur.org/ckfinder/userfiles/files/63004219012.pdf
    • http://yavuzselimvakfi.org/resimler/site/files/69584754712.pdf
    • http://tidomusica.com/uploads/files/202109190859325052.pdf
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/gajepuwogipopoloniletadi.pdf
    • http://pokwuttibut.com/file_media/file_image/file/11756583032.pdf
    • http://abwcolley.com/uploads/files/zotosapekojijiwam.pdf
    • https://juraganmonyet.com/contents/files/fiwex.pdf
    • https://manusingh.org/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/gagumurawubatazagefade.pdf
    • https://newcar-rental.com/uploads/files/202109121322225326.pdf
    • https://peusch.lu/userfiles/files/bijunuma.pdf
    • http://bridgeonlaw.com/filespath/files/20210910005542.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=top+5+best+games+in+the+world+for+android
    • 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_off0000ef10.bin
6c99aba67e7a44d363cdbed58526b6eac0456ba57146322a70efbae265eb6935		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF10 17172 bytes
font_01_sfnt_off00011b71.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B71 16792 bytes
font_02_sfnt_off00013388.bin
49c718650c9720409bff0c32c0188fe94333f4e03b34d6fd0799f058bcaead29		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13388 11268 bytes

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