Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a19095712f1b914…

MALICIOUS

PDF

85.3 KB Created: 2021-09-20 06:46:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ecfd695faff0ff1c3d735197a1a5b452 SHA-1: e764c6635892397f2a4e552a285260865fa563ce SHA-256: 2a19095712f1b91410815b83fe7ec6f9d9784a5dee4c721b0b01e50d1497b3c9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm on disposable hosting, with numerous embedded URLs pointing to various domains. While no executable scripts were extracted, the structure and heuristics suggest the document's purpose is to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.agencesramos.com/ckfinder/userfiles/files/97129743977.pdf
    • http://www.kigimex.com.vn/ckfinder/userfiles/files/vajotituveganiputewejapab.pdf
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147c2b392667---defugonobejenugevimasiv.pdf
    • http://bluecars.pl/userfiles/file/nujimefenilisaka.pdf
    • http://upoart.com/ckfinder/userfiles/files/mudajimixawag.pdf
    • http://fc-junajted.com/upload/datoteke/jatuwomivuw.pdf
    • http://hanlacsclub.com/ckupload/files/jemikefa.pdf
    • http://studiopignotti.it/userfiles/files/85070366737.pdf
    • http://life-homeshop.com/asset/uploads/files/82956782712.pdf
    • https://tomorrowhubs.com/upload/users/files/79302297265.pdf
    • https://cortemadera.com/wysiwygfiles/file/5290498396.pdf
    • http://forglory.cz/ckfinder/userfiles/files/letab.pdf
    • http://montaze.org/democms/userfiles/file/24255215887.pdf
    • http://norilskgu.ru/userfiles/file/gojojajas.pdf
    • http://ateliergermain.club/sites/default/files/file/nasavitevarexixunakidope.pdf
    • http://bnblspecialities.com/userfiles/files/magiwizojerogipotunutumix.pdf
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141051fe9261---656459819.pdf
    • http://hgbs.de/userfiles/file/90312499010.pdf
    • http://aotwresort.net/ckfinder/userfiles/files/98564216210.pdf
    • https://peoplesmodelinternational.com/ckfinder/userfiles/files/tosupilop.pdf
    • http://coffee33.ru/archive/file/kinajomumadi.pdf
    • http://eros-arena.name/eros/userfiles/file/94216573442.pdf
    • https://alkalacarservice.com/public_html/userfiles/file/65595865644.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=airplane+android+games
    • 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_off0000ec9a.bin
8c441f9bbe53e125e553a89e8598b58a4fd0878e5b579285fea3b7f7ff992e45		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9A 16640 bytes
font_01_sfnt_off00011796.bin
88b24bfdda3f83989e72d5d39f18106ba332040a97bd1adb0fc426fb10306dad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11796 10616 bytes
font_02_sfnt_off00012f91.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12F91 16792 bytes

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