Malicious PDF — malware analysis report

Static analysis result for SHA-256 81c5ba93d4b19cfe…

MALICIOUS

PDF

77.5 KB Created: 2021-03-25 01:09:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bdd5c6fecc91ef5c6c4285593acd6bff SHA-1: 76097141fd0bc5b7a4b11512d1b4f8d94895f662 SHA-256: 81c5ba93d4b19cfeecf93bc9ef4a73b0f867246ec95358e6528c1cb33668cac2
104 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of an external URI pointing to a suspicious domain, coupled with heuristics for a download button lure, suggests the document is designed to trick users into downloading a secondary payload. No scripts were extracted, but the overall pattern points to a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://jacksth.ru/wix?keyword=google+drive+trolls+world+tour+mp4
    • http://salonapp.xyz/best_irrigation_controller_20200kwcg.pdf
    • http://tranquils.space/bts_songs_320kbps304za.pdf
    • https://static.s123-cdn-static.com/uploads/4448548/normal_60065497df3fe.pdf
    • https://cdn.sqhk.co/fekerepusa/igxhfjf/warzone_bunkers_map.pdf
    • https://cdn-cms.f-static.net/uploads/4366034/normal_5fea0314987a6.pdf
    • https://cdn.sqhk.co/dukasavubu/ifeYnAH/68929830887.pdf
    • https://cdn.sqhk.co/rajexizeba/MhiPXKn/racecraft_build_and_race_download.pdf
    • https://cdn.sqhk.co/vakolitakap/Pgjs0hc/hp_laptop_wifi_driver_download_for_windows_8.pdf
    • http://santecmb-sarl.com/14838152675loxxu.pdf
    • https://cdn-cms.f-static.net/uploads/4406463/normal_5fe85c27f18ea.pdf
    • http://toppiksnack.xyz/4361045707unkwj.pdf
    • http://onsideball.info/besajowezebije8ks51.pdf
    • https://cdn.sqhk.co/ponesigis/giieYEY/32028419724.pdf
    • https://cdn.sqhk.co/fipimomozuk/gjfhhgg/gujajerujojovukerab.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/870beec7-1c56-48e5-9fe7-fe3336b5c32d/zasazuguma.pdf
    • https://d1159ab4-cbf5-42eb-897b-83a5e94cd7da.filesusr.com/ugd/536122_fc905a287a934c3096fe66b58c8873aa.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0bbb41f6-dff0-4b4d-ac01-db113627af25/ahlan_wa_sahlan_textbook.pdf
    • https://f4ef19d8-372f-49db-bbb6-0f5e16bfa625.filesusr.com/ugd/070799_0449aaf55b224e2086a61a9c56309a5b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/864d1c17-d502-45f9-9da7-73330ab8efac/gijibe.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_off0000f34b.bin
7ce9cbaf40f99665b1c730c80183471afc09610d353ced69a3325259d42f178a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF34B 5340 bytes
font_01_sfnt_off00010585.bin
6456d48d953cce72b633418375af6163662119b5d7cb9c3827a98e76caabe1e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10585 10296 bytes

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