Malicious PDF — malware analysis report

Static analysis result for SHA-256 c48a4a30549acf2a…

MALICIOUS

PDF

70.6 KB Created: 2021-05-24 05:06:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 03be1eabec77637e43d9d17a0b70d6b8 SHA-1: 460a18a2b6f8232efebd455be0534ac35887af5c SHA-256: c48a4a30549acf2a2bddde8eb988c2cfa318a6db7e48f25485357437f73ad40a
96 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically indicating a phishing or trojan threat. It contains an embedded URI pointing to 'resalured.ru', which is highly suspicious and likely part of a phishing lure. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the presence of embedded URLs further supports a phishing or malicious content delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://resalured.ru/strik?utm_term=l%2527evangile+essenien+de+la+paix+pdf+gratuit
    • https://static.s123-cdn-static.com/uploads/4495387/normal_5fdd766d3cb06.pdf
    • https://cdn-cms.f-static.net/uploads/4383460/normal_602a0a78a3e99.pdf
    • https://cdn-cms.f-static.net/uploads/4469638/normal_6063a7987b723.pdf
    • https://cdn-cms.f-static.net/uploads/4504568/normal_60283a60bd7ff.pdf
    • https://cdn-cms.f-static.net/uploads/4387925/normal_606246fb6ad64.pdf
    • https://cdn-cms.f-static.net/uploads/4382949/normal_60272bacbbd52.pdf
    • https://static.s123-cdn-static.com/uploads/4459478/normal_5ff0e0b657d44.pdf
    • https://static.s123-cdn-static.com/uploads/4369165/normal_5fceba2ecdfcc.pdf
    • https://cdn-cms.f-static.net/uploads/4492574/normal_606e3f5d3646d.pdf
    • https://static.s123-cdn-static.com/uploads/4382773/normal_5fee3de796fc8.pdf
    • https://static.s123-cdn-static.com/uploads/4415334/normal_5fcedae7b1bd2.pdf
    • https://cdn-cms.f-static.net/uploads/4471082/normal_6015015ba40dc.pdf
    • https://static.s123-cdn-static.com/uploads/4475209/normal_5feb44ec3bd20.pdf
    • https://cdn-cms.f-static.net/uploads/4474978/normal_6018540d92ded.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fadupazageraf/fantasy_draft_day_cheat_sheet.pdf
    • https://s3.amazonaws.com/jirebonudur/surah_yasin_full_image_download.pdf
    • https://uploads.strikinglycdn.com/files/7a87404c-c521-48de-83c2-a990a21bea59/manual_calculadora_ti-89_titanium_espaol.pdf
    • https://uploads.strikinglycdn.com/files/6623a6db-e8fb-4081-a63a-41fe3354535e/how_to_fix_an_hp_printer_that_wont_print.pdf
    • https://s3.amazonaws.com/daxemo/51213291188.pdf
    • https://s3.amazonaws.com/lebaxa/nuvimovavupe.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_off0000d537.bin
d65507d24e9f07fbcc3cb96e15d1fa763b30fce58e09c116d0811bde8ae1f401
pdf-font-stream PDF embedded font (sfnt) at offset 0xD537 5312 bytes
font_01_sfnt_off0000e770.bin
2068bf942bfab01a9c4683ec42c523c0db7ed46622807d1986ce3e0e92d04d59
pdf-font-stream PDF embedded font (sfnt) at offset 0xE770 11004 bytes