Malicious PDF — malware analysis report

Static analysis result for SHA-256 475557cf44bd4357…

MALICIOUS

PDF

74.8 KB Created: 2021-05-05 14:58:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8f860ac0349717b9610f805ce0c7b238 SHA-1: 235ba63de64cee8d503fff39f806e2c1cfe15ee0 SHA-256: 475557cf44bd4357ee3d9b8de9986b75bf2bac89450967d1c097cc009c03f4e5
96 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ClamAV and an ML classifier. It contains an embedded URL pointing to 'vilenefex.ru', disguised with text suggesting a free movie. While no scripts were explicitly extracted, the PDF structure and embedded URI heuristic indicate an attempt to redirect the user to a potentially harmful external resource, consistent with phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://vilenefex.ru/strik?utm_term=it%2527s+kind+of+a+funny+story+full+movie+free
    • https://static.s123-cdn-static.com/uploads/4414689/normal_5ffe019663cc7.pdf
    • https://cdn-cms.f-static.net/uploads/4494139/normal_6056dcea7288d.pdf
    • http://wide-mean.top/allahabad_high_court_judgement_ordervr55e.pdf
    • https://teraludejos.weebly.com/uploads/1/3/5/3/135304334/kupokujim.pdf
    • https://cdn-cms.f-static.net/uploads/4417531/normal_6021785f7a607.pdf
    • https://taxurazuzar.weebly.com/uploads/1/3/4/0/134042721/wujisoge-kutukutujokib.pdf
    • http://xozonline.ru/407881262136nmjm.pdf
    • https://womafikuv.weebly.com/uploads/1/3/4/6/134668976/fekanu-fexuravajub-fojeboza-minunojuroxur.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tevigotu/samsung_monitor_randomly_turns_off.pdf
    • https://uploads.strikinglycdn.com/files/1a90f794-6955-4d95-9597-59184ad1e01c/napegegixorosokilebajatad.pdf
    • https://s3.amazonaws.com/futamo/how_to_pass_social_studies_ged_test_2019.pdf
    • https://s3.amazonaws.com/negonanopix/driver_booster_3_baixaki.pdf
    • https://9d76d0c6-5807-43ac-a2ba-7b4112d1a20a.filesusr.com/ugd/5cd33b_56210836abcf472cac8ba1609fb04127.pdf?index=true
    • https://uploads.strikinglycdn.com/files/43797cb8-785c-48d9-b544-e5d79f142d4a/16518171944.pdf
    • https://uploads.strikinglycdn.com/files/6c427259-e663-4505-b652-83d3cf53b1d8/will_my_home_warranty_replace_my_furnace.pdf
    • https://s3.amazonaws.com/miledu/agnisakshi_songs_pk.pdf
    • https://uploads.strikinglycdn.com/files/81d9a965-0c21-4330-be06-189ce782142c/rajaj.pdf
    • https://da18e6a8-d720-42de-a88c-3f13daad7efb.filesusr.com/ugd/08fe48_fe895633c07543139d0290d8ce4e47fa.pdf?index=true
    • 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_off0000e7bb.bin
d65560f92222664b818c599a70f41bbfc4f50c1cb648895add0097e6b5f319c3
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BB 5248 bytes
font_01_sfnt_off0000f99b.bin
35f7609663484ea07823f4f3a4c1c42d61d9359f4f9024db7fb9e73519a443cf
pdf-font-stream PDF embedded font (sfnt) at offset 0xF99B 10820 bytes