Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b520d926d577e58…

MALICIOUS

PDF

70.3 KB Created: 2021-09-30 12:18:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 558f8575a1d736395259184f25af14f1 SHA-1: ca2c2a90cc8ba05ac257cbd02b3b7a0310f04d9d SHA-256: 8b520d926d577e58d6cc46ce8c8f39760d303a4c821072165288934475a77268
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains numerous embedded URLs, many of which point to suspicious domains, and one heuristic indicates it's a link farm on disposable hosting. The presence of external URIs and the nature of the detection suggest the PDF is intended to redirect users to malicious sites, likely as part of a phishing campaign or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://majstrissmt.eu/www-data/file/7056532367.pdf
    • https://nibrasimansch.com/userfiles/files/18383817545.pdf
    • http://wohingltd.com/userfiles/kasegapowoxarevuk.pdf
    • http://ville-dammarie.com/ckfinder/userfiles/files/86675645695.pdf
    • http://audidalys.lt/ckfinder/userfiles/files/vuvonan.pdf
    • http://specimport.by/files/files/26059961860.pdf
    • http://smartdeal.pl/files/upload/files/63475244490.pdf
    • http://only-svet.ru/upload/files/59784303343.pdf
    • http://energosol.pl/images_cms/file/wosepejun.pdf
    • https://www.area-tlc.com/public/ckfinder/userfiles/files/bujizaro.pdf
    • https://www.winsum.frl/ckfinder/userfiles/files/dodimurozajavokogik.pdf
    • https://irepairplus.nl/app/webroot/files/userfiles/files/joguzonele.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1613ddf1f88620---jupewizamorujir.pdf
    • http://www.peritaonline.es/ckfinder/userfiles/files/titotilejupozanumabumo.pdf
    • https://ce-mi.pl/uploads/userfiles/files/filenegugisu.pdf
    • https://0a3exp.com/upfiles/editor/files/5905985183.pdf
    • http://nail-free.com/ckfinder/userfiles/files/46331748812.pdf
    • http://channelletterguide.com/ckfinder/userfiles/files/rirumupimogalor.pdf
    • http://slxiang.com/v15/Upload/file/2021911043454113.pdf
    • http://dtyxbpzx.com/filespath/files/20210901112429.pdf
    • https://axlthailand.com/imagexx/files/76790986167.pdf
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/4332474903.pdf
    • http://dreamsurgerycn.com/ckupload/files/napizebabasa.pdf
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614f2e42d0673---70872911523.pdf
    • http://bratislava.topenglish.sk/app/webroot/gallery/files/55923697538.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=graal+online+era+mod
    • 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_off0000b288.bin
ce836ba618c1cfe27e9d6c544eba1af4be8ed267660c029fda639a34c9fb2150
pdf-font-stream PDF embedded font (sfnt) at offset 0xB288 16608 bytes
font_01_sfnt_off0000dd2e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD2E 16792 bytes
font_02_sfnt_off0000f545.bin
609efab43d369eacfcdcae4cea5227e021b6181ce2220a4af2c9c8569cb2fbfe
pdf-font-stream PDF embedded font (sfnt) at offset 0xF545 10184 bytes