Malicious PDF — malware analysis report

Static analysis result for SHA-256 d33d4347a03b206d…

MALICIOUS

PDF

69.4 KB Created: 2021-09-24 21:55:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ee4255ce8073eff32e384d55dc9d486a SHA-1: 7ae142db4e65b52020e504b00839885aefc73828 SHA-256: d33d4347a03b206d50b8ab1b7b8c6b02d85ffc4abf22fe3617ab195fff494c58
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for phishing or distributing further malware. The presence of these links suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://coevent.ru/upload/files/kudesadat.pdf In PDF document text
    • http://jakpaisanestate.com/images/upload/files/pituvobativibaf.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/babosororavenudekigageman.pdfIn PDF document text
    • https://fajndoktor.cz/images/file/files/17939519638.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/51742513098.pdfIn PDF document text
    • https://szabobuszberles.hu/files/files/68396562218.pdfIn PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/sokowalaminuxebaxaj.pdfIn PDF document text
    • https://xn--80aggmy8c6c.net/UserFiles/File/sijugewonaf.pdfIn PDF document text
    • http://sgpeo.pl/users/file/43200279967.pdfIn PDF document text
    • http://e68momo.com/shopadmin/upload/files/59398723241.pdfIn PDF document text
    • http://chinalabware.es/d/files/volaresesali.pdfIn PDF document text
    • https://bozoklar.org/ckfinder/userfiles/files/jafebifenisoxoxepixaj.pdfIn PDF document text
    • https://mimzyonline.com/userfiles/file/67282680799.pdfIn PDF document text
    • http://basar-hemeringen.de/ablage/userfiles/files/27822694939.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/rasuzovolebosufomuloneg.pdfIn PDF document text
    • https://zhavezbozi.cz/data/file/63075738617.pdfIn PDF document text
    • http://tuanlongland.com/upload/files/wopibifok.pdfIn PDF document text
    • http://pluimveebeurs.com/userfiles/file/13652491405.pdfIn PDF document text
    • http://sithome.com/upfiles/file/20210912103702.pdfIn PDF document text
    • http://greddy.com/admin/common/ckfinder/userfiles/File/86813014387.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/bdbe037fabecb681166149513561345e/sasekupitiwawepalufi.pdfIn PDF document text
    • http://diamant-x.sk/UserFiles/file/detofidebebibepolezumame.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=yts+apk+free+downloadPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000af7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF7F 15840 bytes
SHA-256: 7d266473617889c3bdef962680457e820553c8fa393d51ddf07a0b755754e83e
font_01_sfnt_off0000d7b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000efce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCE 10560 bytes
SHA-256: 876b15a08baa31acb6df875566606150bb2193fda29ab0eb028d2fd5b4176176

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