Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d9d05e6fdae0518…

MALICIOUS

PDF

171.1 KB Created: 2021-04-03 01:46:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 280a0c110254cffb1a8631abf6d169e9 SHA-1: 5d0e5d478fdfd7053114accc738c971387f8d191 SHA-256: 4d9d05e6fdae05183a04b3d25cad5f93ca2d08d1391c7cd27b3fd0eac99868d5
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains an embedded URI pointing to 'kuzutuzo.ru', which is likely a malicious domain used to host the phishing content. The document body, though heavily obfuscated, suggests a 'color theory psychology test' lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • 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://kuzutuzo.ru/strik?utm_term=color+theory+psychology+test
    • http://pibugimax.iblogger.org/nukewawupivo.pdf
    • https://cdn.sqhk.co/rorajakura/Rmshehg/dasisog.pdf
    • https://static.s123-cdn-static.com/uploads/4500450/normal_5fe40be3ca3af.pdf
    • https://cdn-cms.f-static.net/uploads/4530712/normal_6055561633b31.pdf
    • https://cdn.sqhk.co/tamejenonisi/XHidxih/spiral_ham_in_crockpot_with_coke.pdf
    • https://cdn-cms.f-static.net/uploads/4445558/normal_605dda3b7ae98.pdf
    • https://cdn.sqhk.co/kokademesuz/hgAjjOR/32155203276.pdf
    • http://jixelaxoli.66ghz.com/vizikodukeminerixegutab.pdf
    • https://cdn-cms.f-static.net/uploads/4421472/normal_6066bb4528707.pdf
    • http://lutosiniboj.22web.org/lanofunizinu.pdf
    • https://cdn.sqhk.co/roratumopiv/xwL3jak/vuvisuto.pdf
    • https://cdn-cms.f-static.net/uploads/4495849/normal_6064ffac80152.pdf
    • https://cdn.sqhk.co/mumoragato/jbgc6df/76502400843.pdf
    • https://static.s123-cdn-static.com/uploads/4464524/normal_5ff9903b1b7f1.pdf
    • https://cdn.sqhk.co/veleviziwew/mji0ifq/dojosomeleg.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/5e100631-f7ab-4261-b1f3-00be71ddb68f/1993_mercruiser_5.0_service_manual.pdf
    • https://uploads.strikinglycdn.com/files/2e98fa57-7b62-402f-b0d8-f4dea62ce793/50812821298.pdf
    • https://uploads.strikinglycdn.com/files/98feb7ae-52f8-45be-89f2-c5454fd86d29/avantapure_water_softener.pdf
    • https://uploads.strikinglycdn.com/files/8abbcc3c-0720-4f08-b461-9eba90cc61ed/plantronics_bluetooth_headset_pairing.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_off00025a49.bin
412f6dd8ff2d066e2cfb27e8e3ac60ceacfe77fa10fc975710557e4551616df0
pdf-font-stream PDF embedded font (sfnt) at offset 0x25A49 4744 bytes
font_01_sfnt_off00026a90.bin
7e9d325989ee36e0ad811ca5a7cf372859c8f8b05599be1a5db726c6f9b7dda3
pdf-font-stream PDF embedded font (sfnt) at offset 0x26A90 11220 bytes
font_02_sfnt_off000290b1.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f
pdf-font-stream PDF embedded font (sfnt) at offset 0x290B1 4324 bytes