Malicious PDF — malware analysis report

Static analysis result for SHA-256 a763bffb2c0f40b8…

MALICIOUS

PDF

78.1 KB Created: 2021-03-18 12:44:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1c38db03d1eaae03e52055bab7d2046a SHA-1: 161537f4c5791b91341e6f42addcbed3f20356ac SHA-256: a763bffb2c0f40b86d58ad0921758d8ff053de767092fef92ddd41ad2f5d389d
144 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File T1059.007 JavaScript

The PDF document was flagged by a machine learning classifier and ClamAV as malicious. The 'SE_CLICKFIX' heuristic indicates the document likely instructs the user to press Win+R or paste a command into a terminal, consistent with social engineering attacks designed to bypass macro restrictions. The embedded URL 'https://vilenefex.ru/strik?utm_term=how+to+setup+logitech+wireless+gamepad+f710' suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://vilenefex.ru/strik?utm_term=how+to+setup+logitech+wireless+gamepad+f710
    • https://cdn.sqhk.co/pofifarim/19jfYjc/apple_carplay_digital_media_player.pdf
    • https://cdn.sqhk.co/kikepedu/ijAjjjc/nfl_fantasy_football_mock_draft_12_team_ppr.pdf
    • https://cdn.sqhk.co/kevovevude/kjijje1/amazing_world_of_gumball_school_in_real_life.pdf
    • http://dikoxikikalonib.scienceontheweb.net/counting_by_7s_book_talk.pdf
    • http://pigigozoruda.mypressonline.com/68193174033.pdf
    • http://zudepogumo.medianewsonline.com/nufuxuladekenevifaxofonu.pdf
    • https://cdn.sqhk.co/jotepomi/Lggjbid/ualberta_eclass_zoom.pdf
    • http://bomumerodozo.22web.org/roxixadufirimojezutefox.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/7623da5f-4efd-4c9b-98a1-682a3be727b3/rock_band_4_drums_ps4_walmart.pdf
    • http://jepogedepujadul.rf.gd/nulijulunexodumonabida.pdf
    • http://sonevovavar.rf.gd/73413728689.pdf
    • http://miwefonozez.epizy.com/ranewupuzono.pdf
    • http://wadoromutisagar.myartsonline.com/athlean_x_ax1_workout.pdf
    • https://uploads.strikinglycdn.com/files/cc4fec43-4205-43b4-9750-e51c15f9bc98/39723915934.pdf
    • http://faxiruvud.myartsonline.com/make_a_chart_on_parts_of_speech_with_pictures_and_examples.pdf
    • http://tofujuwo.onlinewebshop.net/82893557149.pdf
    • http://dewelimu.epizy.com/kojokijivodeta.pdf
    • https://uploads.strikinglycdn.com/files/319187d5-e8ed-4233-8624-e01ffe731867/51085383642.pdf
    • http://putetudufotu.rf.gd/zodet.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_off0000edb8.bin
48955ecbdc501748ec34c302e6e48f3c309b0ed3bee191cf35d73ea1dcbe6978		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB8 5896 bytes
font_01_sfnt_off000101c7.bin
a445d7bf4ad0b8e09b4317498c99243d17f6fe926123f1fdf1b4b89c9aa731de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101C7 12124 bytes

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