Malicious PDF — malware analysis report

Static analysis result for SHA-256 9889b0b95b2891f7…

MALICIOUS

PDF

90.0 KB Created: 2021-04-02 14:41:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1c46bd73cc59efe8c8f943e43c5150d0 SHA-1: d68cf84e08f6eabb56661be8605753beb6da8ec5 SHA-256: 9889b0b95b2891f7397a396776bcec994b72104eee9fb800eca7acac3cfb7f43
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with the primary one being https://kuzutuzo.ru/wix?keyword=ben+10+ripjaws+fanfiction, likely intended to redirect the user to a phishing site. No scripts were extracted, but the presence of embedded URLs and the nature of the detection suggest a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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/wix?keyword=ben+10+ripjaws+fanfiction
    • http://boxijogirexu.medianewsonline.com/where_to_buy_blood_bowl_miniatures.pdf
    • https://static.s123-cdn-static.com/uploads/4483075/normal_5fce4a2716845.pdf
    • http://sobebal.22web.org/how_to_improve_creative_writing_skills_in_english.pdf
    • https://nafuvazufu.weebly.com/uploads/1/3/1/4/131407552/1d3419ed.pdf
    • https://wisufisuzok.weebly.com/uploads/1/3/1/3/131383924/nezuku_diked.pdf
    • https://dutagoloz.weebly.com/uploads/1/3/0/8/130814416/radekepedeko.pdf
    • https://cdn-cms.f-static.net/uploads/4469645/normal_605fed3ebb109.pdf
    • http://rugozuravonabib.22web.org/cartoon_boy_png.pdf
    • http://xilexevu.scienceontheweb.net/aircraft_parts_and_their_functions.pdf
    • https://static.s123-cdn-static.com/uploads/4370072/normal_5fdd484373c82.pdf
    • https://tenomexob.weebly.com/uploads/1/3/1/1/131163969/7024570.pdf
    • https://static.s123-cdn-static.com/uploads/4417644/normal_5ffe6fd0917f9.pdf
    • https://cdn-cms.f-static.net/uploads/4380890/normal_5fd25ad8b8766.pdf
    • http://gadetebes.sportsontheweb.net/77875245774.pdf
    • http://rorezorejadij.iblogger.org/web_application_development_proposal_template.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://sutexuvidag.myartsonline.com/tazaxunatijijinifelegu.pdf
    • http://nipelijikiki.onlinewebshop.net/zilulumuwenutejomapuwizis.pdf
    • https://uploads.strikinglycdn.com/files/99493248-ff80-4146-8cf5-969d533c66bb/74342235830.pdf
    • https://uploads.strikinglycdn.com/files/fff5d4ff-a0fd-423b-9e5e-a26d729c6f48/76908320569.pdf
    • http://telewazikenap.rf.gd/mivagejikamepikomujujogi.pdf
    • http://zadajipi.epizy.com/bangalore_bye_laws_2020.pdf
    • https://uploads.strikinglycdn.com/files/47f94673-34db-42f8-9e8f-3cef61153e2b/night_owl_security_camera_instructions.pdf
    • http://janarisugikev.rf.gd/50845635877.pdf
    • https://uploads.strikinglycdn.com/files/25a482a8-6e92-41c6-81d5-27e4dc609358/64607448798.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_off000114f2.bin
256445c84059635d5af357c3d54ecf7558ee6ee432723b1b2231a821a6103fac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x114F2 5176 bytes
font_01_sfnt_off000126a0.bin
d19eff9c4ed2d457a44251d5106a6648eeffaa1cd8dae7ab582db4b2f52c32c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x126A0 10908 bytes
font_02_sfnt_off00014bfc.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14BFC 4324 bytes

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