Malicious PDF — malware analysis report

Static analysis result for SHA-256 75b95761e4e4db63…

MALICIOUS

PDF

70.1 KB Created: 2021-03-17 09:21:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e692ecb9b89fffbffd835e56a1510e02 SHA-1: 1bb630a02b988d32f159d5dfecab5865e7f43b44 SHA-256: 75b95761e4e4db63256678e03dd624ffcf68c0e2b15dd6889d724d0582256db0
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document employs a social engineering lure, instructing the user to install a browser extension to view its content. The heuristic 'SE_BROWSER_INSTALL_LURE' strongly indicates this intent. The presence of numerous external links, including a link farm detected by 'PDF_SEO_LINK_FARM', suggests the document is designed to redirect users to malicious sites or download further payloads. ClamAV detection confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://golowaki.ru/123?utm_term=html+href+pdf+file
    • https://cdn.sqhk.co/dizukenepu/cCohiUN/vidiq_chrome_extension.pdf
    • https://rijagadufe.weebly.com/uploads/1/3/1/6/131606992/9301650.pdf
    • https://kijujula.weebly.com/uploads/1/3/4/7/134756294/5916797.pdf
    • https://lekomitigukajar.weebly.com/uploads/1/3/5/3/135345412/f2aeaebb6b3.pdf
    • https://jetezoxow.weebly.com/uploads/1/3/1/3/131379231/29bf25f3384e43e.pdf
    • https://cdn.sqhk.co/gonolesuzam/afkyrje/98401164920.pdf
    • https://salovunuwav.weebly.com/uploads/1/3/0/9/130969923/vigoj_zovafexi_simamesej_jagezotik.pdf
    • https://vevikonupefafo.weebly.com/uploads/1/3/5/3/135391347/12789ab.pdf
    • https://lakerevuko.weebly.com/uploads/1/3/4/6/134654656/tupijemogeku.pdf
    • https://cdn.sqhk.co/jijatidos/fjawe1m/vmm_recorder_song_hot_cross_buns.pdf
    • https://cdn.sqhk.co/lerutefo/nfbYsi3/sulevoredasigegavenikubig.pdf
    • https://cdn.sqhk.co/wejawujagi/giihicH/zadupejupuxopa.pdf
    • https://buzikapafopix.weebly.com/uploads/1/3/4/3/134375334/vatozivesuvinedajega.pdf
    • https://cdn.sqhk.co/savageven/i4jcidB/40091831602.pdf
    • https://junurewumopu.weebly.com/uploads/1/3/2/7/132740614/weterejirixipobudo.pdf
    • https://cdn.sqhk.co/wirepoti/hegdQgf/natukubamuvagum.pdf
    • http://sulevaxobema.22web.org/5956197938.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://gusozafameximi.epizy.com/40411883006.pdf
    • http://kebojupevanivi.rf.gd/62777108111.pdf
    • http://ratotepuno.rf.gd/rumezisaletajudirinineb.pdf
    • 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://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c858.bin
b47b51feabfd9fce08e064580f741d4807b8c3420b8e3b89beee08f92ccb610e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC858 4424 bytes
font_01_sfnt_off0000d751.bin
a0ec75779cbe355427b7d8d291ca4cc897a85cc98db778fa261f27981959b241		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD751 10744 bytes
font_02_sfnt_off0000fbf0.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF0 4324 bytes

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