Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ff8408e0ea58680…

MALICIOUS

PDF

80.9 KB Created: 2021-09-13 10:58:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e52edc0cdcea5d77b8c662e11af82768 SHA-1: 201d34b35d9f44fa67533a86df49071a7cdc8880 SHA-256: 2ff8408e0ea5868028755f456260966f3e2b72b3e4e61ab51087c2d2e96ebea1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, with many pointing to distinct hosts, suggesting a link farm designed to distribute further malicious content or phish users. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://laborke.ru/uplcv?utm_term=vlc+player+for+android+mobiles
    • http://bpabv.nl/uploadfiles/file/wavuzufotof.pdf
    • https://dauglita.lt/components/com_mijoshop/opencart/image/data/files/28762077987.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613e352553497---wenibeg.pdf
    • http://aalzkj.love-mrt.com/upload/files/14563089407.pdf
    • http://lumieye.com/userData/ebizro_board/file/84154052476.pdf
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/46049662114.pdf
    • https://pracowniatechart.pl/fckpliki/file/80873022934.pdf
    • http://wohntraumgmbh.at/2073189981.pdf
    • http://thaoduocvn.com/userfiles/image/file/fojik.pdf
    • http://ristoranteibucanieri.it/userfiles/files/duribe.pdf
    • http://kartinatv.org/uploads/files/depopalisa.pdf
    • https://vatlieutaphu.com/upload/files/11473579664.pdf
    • http://resurrection-life.net/userfiles/files/30440127086.pdf
    • https://yptea.com/data/fckeditor/files/95113873780.pdf
    • https://foulardfotografando.it/file/kajimubik.pdf
    • http://quaint-house.com/images/blog/file/porotowirijake.pdf
    • https://akvaguru.hu/user/file/98393563720.pdf
    • http://mezon.jp/userfiles/file/65745654299.pdf
    • https://greenvalleykerala.com/ckfinder/userfiles/files/43155247104.pdf
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/nipifugu.pdf
    • https://oancora.com/ckfinder/files/64270909826.pdf
    • https://rmp-familienanzeigen.de/cms/files/55493445138.pdf
    • http://ebd.su/UFD/7623/files/81419278219.pdf
    • http://plymouth-logs.co.uk/ckfinder/userfiles/files/22325210792.pdf
    • http://thermocomfort.ca/userfiles/file/25200577872.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_off0000d76e.bin
e0ac03182e41350bf50105977d238a004f78c35097984180d674e66b6c337b51		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD76E 10908 bytes
font_01_sfnt_off0000f06f.bin
adfbfbc4c7c44be2a92a8616de0f2cd79f88e9828ff89aa4898c230f3160077c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF06F 17432 bytes
font_02_sfnt_off00011df6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF6 16792 bytes

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