Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f96dd263e27aa3e…

MALICIOUS

PDF

75.5 KB Created: 2021-02-21 19:11:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 9619088d589f64b3c02181121835e045 SHA-1: bea0ffdfa40e2ae207a3e0986af6cbac24b6e099 SHA-256: 3f96dd263e27aa3e9ed88456d303b06f6489edfb2ad12e9ee96d537fddb99d77
96 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with a specific detection name indicating it's a phishing trojan. It contains an embedded URL pointing to 'bologen.ru', which is likely part of the attack chain. Although no scripts were explicitly extracted, the PDF structure and embedded URI heuristic suggest an attempt to redirect the user to a malicious site, consistent with a phishing or malware delivery lure.

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://bologen.ru/wix?keyword=types+of+irony+worksheet+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413973/normal_5fd125b20bd85.pdfIn PDF document text
    • https://cdn.sqhk.co/jopuromug/I0Xje4Y/stick_war_legacy_mod_apk_download_link.pdfIn PDF document text
    • https://cdn.sqhk.co/ributexovek/jjfH1DY/femogonisilobagotim.pdfIn PDF document text
    • https://cdn.sqhk.co/vafegijateno/ejhcOha/oof_clicker_game.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383470/normal_5fd61e06761eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411229/normal_60168bcad05f0.pdfIn PDF document text
    • http://tawojuxonivix.22web.org/kifujemezesidutofinupa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412570/normal_6018329a75c76.pdfIn PDF document text
    • https://cdn.sqhk.co/nolagutotato/gifjghh/68172894989.pdfIn PDF document text
    • https://cdn.sqhk.co/nuvexajamu/hbh1GQU/when_does_the_walking_dead_premiere_2019.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
    • http://bonizeza.epizy.com/50762369367.pdfIn PDF document text
    • http://dawivek.rf.gd/zenosibosukajoro.pdfIn PDF document text
    • http://kivekogifix.epizy.com/tubogesobiwu.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_off0000deab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAB 4880 bytes
SHA-256: 272f68701c8e45505baffdc8c2883602088195372c7b52eec19e258536145854
font_01_sfnt_off0000ef56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF56 10476 bytes
SHA-256: 2b5d5901e0a6b237a1753566c2ed3075f1d2802e9b5b35c721f53c3cfd9ce704
font_02_sfnt_off0001132f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1132F 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333