Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5a7c70f10340830…

MALICIOUS

PDF

79.7 KB Created: 2021-09-18 09:45:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 975d875ef8d755bcfe110c4db6cf2382 SHA-1: b8bc4158ebd0404bcbcd587e835b9dcd0e984ba6 SHA-256: a5a7c70f103408305cc758610f04bad66f385122e9901ff1cc2ed9ccc5002db3
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The document body is heavily obfuscated, preventing a clear understanding of its direct content, but the heuristic firings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6920

Heuristics 4

  • 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
  • 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://archism.ru/uplcv?utm_term=yts+free+movie+download
    • http://veterinariacomportamentale.it/userfiles/files/niwopulutobifinowubuk.pdf
    • http://paneldeconso.com/userfiles/file/fawafapapavelifakosajesa.pdf
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/dd282504816c83c837a3ba698f1fb975/95051918182.pdf
    • http://fitviewer.com/files/file/molevavomovaxawimok.pdf
    • https://processwork.archerhuang.com/ConImg/files/berurakakula.pdf
    • http://vector-food.pl/userfiles/file/fakexabosixib.pdf
    • http://sccsfz.org/upload/2021-09/fexedogofewi.pdf
    • http://sakaryakasaplarodasi.org/userfiles/file/68320160221.pdf
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae9815e124---55724744467.pdf
    • https://iveducentar.com/uploads/assets/file/36499616807.pdf
    • https://peoplehelppeople.net/uploads/File/lopipuluwi.pdf
    • http://kxqcgs.net/filespath/files/20210906061958.pdf
    • https://andrejc.si/files/file/faluru.pdf
    • http://thaifilmind.com/UserFiles/file/womuzikal.pdf
    • http://chromavials.com/d/files/71829178323.pdf
    • https://asoriofrio.org/ckfinder/userfiles/files/27757930073.pdf
    • https://hobbypet.cz/files/file/jaxepogativezakewudokufo.pdf
    • https://tucarrorentacar.co/ckfinder/userfiles/files/zitixidinusovodobawopum.pdf
    • http://namhungholdings.com/uploads/ckfinder/files/vikoxarozitebunori.pdf
    • http://pegasomeeting.medcoast.net/ckfinder/userfiles/files/sorevikidal.pdf
    • http://yoron.net/up/files/47411506981.pdf
    • http://sjccgy.com/userfiles/file/wisujabakejudatirepivev.pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011719.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11719 16792 bytes