Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6c5e1d5befa6505…

MALICIOUS

PDF

84.8 KB Created: 2021-09-18 07:14:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 35642114d8c61618db3cafdf7d56dd46 SHA-1: 59588b46c32d886c7651584d5adf4d9ccefc9ebc SHA-256: a6c5e1d5befa6505d80f05eaa78cda26f8b5ce2dfe877cc1613dc0628f67306d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://kmbb.at/userfiles/file/1298011664.pdf In PDF document text
    • http://48bulls.com/js/upload/files/2038027843.pdfIn PDF document text
    • https://mitrasuksesku.com/userfiles/file/33671114638.pdfIn PDF document text
    • https://tatvan.in/userfiles/file/golupumidolojap.pdfIn PDF document text
    • http://petgears.com/app/webroot/files/file/44699969661.pdfIn PDF document text
    • http://trungnguyenjsc.vn/uploads/image/files/67715004077.pdfIn PDF document text
    • http://tylincms.com/userfiles/files/lefowopedise.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/lifunolapadezutizuve.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/53708469081.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/luxelamebipunotijigifu.pdfIn PDF document text
    • https://omnistopbollards.com/application/third_party/ckfinder/userfiles/files/80342356995.pdfIn PDF document text
    • https://bimore.vn/webroot/img/files/32124017177.pdfIn PDF document text
    • https://granitnet.hu/editor_up/kudatujutaxesudik.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/53399275623.pdfIn PDF document text
    • http://chelseafoodmart.com/uploads/files/legutujorutozek.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/9b52091c65d3411ff183cd662681f3da/peduniwutugan.pdfIn PDF document text
    • http://bestpokeya.com/uploads/files/66104958856.pdfIn PDF document text
    • http://freetourscadiz.com/ckfinder/userfiles/files/73046961474.pdfIn PDF document text
    • https://virker-ikke.dk/files/wusirokox.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130e8fb5b60b---fufamikifefupusilamabano.pdfIn PDF document text
    • http://www.moyekolodin.com/files/nojirixafij.pdfIn PDF document text
    • http://tnmetalworks.com/images/files/wixud.pdfIn PDF document text
    • http://simonide.org/userfiles/file/ruxurawixisevusovulas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=play+minecraft+trial+onlinePDF 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_off0000e537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE537 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD4E 10444 bytes
SHA-256: 57ea1449834a671c646ddbdd8a2c3a5512e505c48256c5c981ff652ad20e6df9
font_02_sfnt_off000114fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114FC 18840 bytes
SHA-256: c14536c4e7c110bd4e5af5dcc8d5202a9609c058ffe3494fa729589fbd825ec6

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