Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b4dff7bdf66444d…

MALICIOUS

PDF

74.5 KB Created: 2021-04-03 08:46:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8888d8191211fd1388ddb4302699b649 SHA-1: 12d3be9fee812c0157b4832becdd53a5f43d8ca3 SHA-256: 5b4dff7bdf66444d2aa4e37a1577221a3df8a8ceef2249508c0f343c5652c9b9
136 Risk Score

Malware Insights

MITRE ATT&CK
T1059 Command and Scripting Interpreter T1566.001 Spearphishing Attachment

The PDF contains a heuristic indicating a clipboard command execution lure, instructing the user to copy and paste content into a shell. This, combined with the ML classifier and ClamAV detection, strongly suggests a malicious intent to trick the user into executing commands. The embedded URL points to a suspicious domain, likely part of the attack chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://ponafet.ru/award?keyword=analyzing+likert+scale+data+pdf
    • https://cdn-cms.f-static.net/uploads/4403556/normal_5fd2cf61cca87.pdf
    • https://cdn-cms.f-static.net/uploads/4495043/normal_604136442f40d.pdf
    • http://rajeziriga.scienceontheweb.net/new_catholic_mass_responses_in_tamil.pdf
    • https://cdn.sqhk.co/mujekesire/5MPNjck/hex_wars_2.pdf
    • https://cdn-cms.f-static.net/uploads/4453730/normal_60171aacbc1df.pdf
    • http://rameautbxy.space/60852692651fv97m.pdf
    • https://cdn.sqhk.co/puvijupem/wKggqYH/ark_survival_evolved_xbox_one_size.pdf
    • http://fijubigatusurov.scienceontheweb.net/kukurepomomosolabexave.pdf
    • https://cdn-cms.f-static.net/uploads/4405904/normal_5fd8768c40f36.pdf
    • https://cdn-cms.f-static.net/uploads/4415526/normal_602788e7e35bd.pdf
    • https://cdn.sqhk.co/rikopekela/9jjqzRg/rowilizagidibu.pdf
    • http://findssldz.xyz/juganodpvm81.pdf
    • https://cdn-cms.f-static.net/uploads/4402014/normal_60344cc1b3772.pdf
    • https://cdn-cms.f-static.net/uploads/4388283/normal_6066cfea22871.pdf
    • https://cdn-cms.f-static.net/uploads/4444371/normal_5fd889528a0a1.pdf
    • http://gojovujewinunuj.mygamesonline.org/12241613547.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://duginefasozuna.rf.gd/93521413778.pdf
    • http://potubavaziripek.epizy.com/cooking_merit_badge_worksheet_2017.pdf
    • http://gozenabuzixi.onlinewebshop.net/wojukimevevowosu.pdf
    • http://fofuxolisemaxim.epizy.com/stepper_motor_arduino_datasheet.pdf
    • http://laxonuzuw.epizy.com/bogle_book.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e33a.bin
7aa2b9b62dfdf5b17db195e6401069d0769b704167e103ef544bb668b480caeb
pdf-font-stream PDF embedded font (sfnt) at offset 0xE33A 5528 bytes
font_01_sfnt_off0000f637.bin
c13c6ed80b65c5cbccc835d36b96539558a70b1860d9c9e89054dfd68c550105
pdf-font-stream PDF embedded font (sfnt) at offset 0xF637 11312 bytes