Malicious PDF — malware analysis report

Static analysis result for SHA-256 feb3aabdb2f58fe1…

MALICIOUS

PDF

75.6 KB Created: 2021-03-24 07:00:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 126b902d4e2411bdc0c1564cc905b13e SHA-1: ca5e16d90c65765256c538b9d4ddd342ad1dad79 SHA-256: feb3aabdb2f58fe18e6c73348921e28f006e1c860ca1f80e3b0f99921c621c75
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 an embedded URI pointing to 'https://jacksth.ru/wix?keyword=super+smash+bros+melee+unblocked', suggesting a phishing lure related to the video game 'Super Smash Bros. Melee'. The document body, though heavily obfuscated, contains metadata related to wkhtmltopdf and the game title, reinforcing the lure. No scripts were extracted, but the presence of external URIs and the malware detection indicate a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/wix?keyword=super+smash+bros+melee+unblocked PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4377933/normal_6058e32245d9a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406454/normal_6019028ede6e7.pdfIn PDF document text
    • http://wijetaz.mypressonline.com/apiculture_assignment.pdfIn PDF document text
    • http://varuvoruva.iblogger.org/cd_rom_drive_windows_10.pdfIn PDF document text
    • http://jiwabozaxexe.mypressonline.com/826611445.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404500/normal_5fda83bd9b628.pdfIn PDF document text
    • http://luxasireku.sportsontheweb.net/avancemos_2_textbook_leccion_preliminar.pdfIn PDF document text
    • http://mibotirekusiw.mywebcommunity.org/45431868268.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426425/normal_601afc6f9e95f.pdfIn PDF document text
    • http://sujabupinoda.scienceontheweb.net/building_android_apps_in_python_using_kivy.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/buwosevax/jixuno.pdfIn PDF document text
    • https://s3.amazonaws.com/dugibabafod/cadillac_escalade_2005_manual.pdfIn PDF document text
    • http://bemegozipebim.epizy.com/16797490118.pdfIn PDF document text
    • https://s3.amazonaws.com/juvetaso/89774053524.pdfIn PDF document text
    • http://toririli.rf.gd/heard_on_the_street_github.pdfIn PDF document text
    • http://xobebol.onlinewebshop.net/13552233590.pdfIn PDF document text
    • http://pawepeg.atwebpages.com/93828577455.pdfIn PDF document text
    • https://s3.amazonaws.com/salosibejodod/basic_naval_architecture_ship_stability.pdfIn PDF document text
    • http://pelebirepopo.onlinewebshop.net/used_aeron_chair_for_sale_singapore.pdfIn PDF document text
    • http://jimatisejur.rf.gd/13437657625.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC9 5376 bytes
SHA-256: 9326764fd79a17f0f91051819c435433d76b33e8b47a99e102f6496b40b38d68
font_01_sfnt_off0000edca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCA 10904 bytes
SHA-256: 9694c7fa662696275fd90bcec70e8032452127d03dd2382822298dbb43d0749c
font_02_sfnt_off000112db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112DB 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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