Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a581d5b4405a932…

MALICIOUS

PDF

94.3 KB Created: 2021-09-11 03:54:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 7951b49b6a610127193b6486fbe8c4ca SHA-1: 50d5a3131859deee580c5782e5a0d35e39f5e391 SHA-256: 9a581d5b4405a932bc6749d638a1a509eca4516f0a47913e1615005281ef25d1
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating it contains malicious content. It functions as a link farm with numerous external URLs, many hosted on disposable domains, suggesting a phishing or malware distribution scheme. The presence of external URIs and the link farm heuristic strongly suggest an attempt to lure users to malicious sites, likely as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5516

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://drafthe.ru/uplcv?utm_term=stadia+controller+bluetooth+android PDF link annotation
    • http://bridgeonlaw.com/filespath/files/20210904210132.pdfIn PDF document text
    • http://kuryakyn.ru/userfiles/file/fonejumoboxulipimubada.pdfIn PDF document text
    • http://www.addvanceo.info/userfiles/files/wukekunel.pdfIn PDF document text
    • https://trinityautorepairs.com/uploads/files/wadokekunowusagubeluxetur.pdfIn PDF document text
    • https://resulgame.com/calisma2/files/uploads/27399044026.pdfIn PDF document text
    • http://www.moyekolodin.com/files/madadibu.pdfIn PDF document text
    • http://vino-charlie.cz/userfiles/file/57928083933.pdfIn PDF document text
    • http://gamaxmotor.cz/data/dokumenty/tafesobagoxumolupukunusip.pdfIn PDF document text
    • http://ipsaix.com/ckeditor/ckfinder/userfiles/files/70040583845.pdfIn PDF document text
    • http://theurbanbazzaar.com/userfiles/file/66561684771.pdfIn PDF document text
    • http://wsospice.org/uploads/userfiles/file/file/mubizog.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137f06200490---lajasudofedisexetanukipi.pdfIn PDF document text
    • https://pracowniatechart.pl/fckpliki/file/1364591016.pdfIn PDF document text
    • https://mongolia-volkslift.com/uploads/files/1091401358.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/40744175476.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/73776010317.pdfIn PDF document text
    • https://momentous-inst.com/uploads/image/files/lobarokufukib.pdfIn PDF document text
    • http://sanxuatbanthinghiem.org/app/webroot/uploads/files/zelomivudixuwavexud.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/32f11950f063234fd1ff165d17722833/45128866584.pdfIn PDF document text
    • http://wadirumshootingstars.com/userfiles/file///67160393704.pdfIn PDF document text
    • http://shahgrp.com/uploads/9955398498.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/jejudesuxajo.pdfIn PDF document text
    • https://www.aicsmindia.org/ckfinder/userfiles/files/ludotukukujitowirup.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014ef2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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