Malicious PDF — malware analysis report

Static analysis result for SHA-256 10ab6e1fc9d951c8…

MALICIOUS

PDF

76.3 KB Created: 2021-03-22 14:36:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 75219ab5e3eeaf24b3eb8eed963d9aa8 SHA-1: 2b4641c49551608999fa48672f88c8ff22c4bd8d SHA-256: 10ab6e1fc9d951c811243fb191b830b79041d5944c1117eb29bc1e4e50201b60
96 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, specifically as 'Pdf.Phishing.Trojan'. It contains an embedded URL pointing to 'https://nipisod.ru/aws?utm_term=describe+the+sunspot+cycle', which is likely used to deliver a secondary payload or conduct phishing. The document body, though heavily obfuscated, contains text fragments related to the sunspot cycle and the wkhtmltopdf application, suggesting a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://nipisod.ru/aws?utm_term=describe+the+sunspot+cycle
    • https://cdn-cms.f-static.net/uploads/4487902/normal_6039a913dd466.pdf
    • http://netunesufugu.22web.org/wuzuzovurijati.pdf
    • http://chempion.coffee/important_genetic_disorders_worksheet_answer_keyvopcj.pdf
    • http://zathkatow.xyz/29088350659fcbhc.pdf
    • http://devgm.design/how_to_disassemble_a_kel-tec_380kbefh.pdf
    • https://cdn-cms.f-static.net/uploads/4379601/normal_60461d30b011f.pdf
    • http://free-at.pro/47216393188scg0f.pdf
    • http://bogplaktnc.fun/baxox33msy.pdf
    • http://karaulovlife.site/17515602059f16sj.pdf
    • http://avbox.org/quit_claim_deed_form_florida_freeqnb25.pdf
    • http://pubggaming.online/82054544415wm379.pdf
    • https://cdn-cms.f-static.net/uploads/4505326/normal_601ba90f1c151.pdf
    • https://cdn-cms.f-static.net/uploads/4407062/normal_6010d08758a99.pdf
    • http://edevletorg.com/73955409110hfhop.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://murexerodan.rf.gd/the_assassins_blade_book_summary.pdf
    • https://19972ee8-34f0-4900-8009-9f590161cd02.filesusr.com/ugd/64db51_09cfe25ffbe24189842c6768295bb817.pdf?index=true
    • http://fopatumupun.epizy.com/baofeng_bf_888s_user_manual.pdf
    • https://s3.amazonaws.com/wovisak/76024718710.pdf
    • http://remofexemuja.rf.gd/alessandro_baricco_libros.pdf
    • https://s3.amazonaws.com/tuxutedi/lodutobuwoxidok.pdf
    • https://30621b86-6952-4b41-80af-4d24d830bc7c.filesusr.com/ugd/122077_c329a6d0ecc44c9f82e7fc050db67bee.pdf?index=true
    • http://nemebikox.epizy.com/animals_maroon_5_lyrics.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_off0000ee0a.bin
eb966bd2085656831a03f8cbb6f2d59ffbbf7e2f18aa3fa404fae158bc140ea5
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0A 5052 bytes
font_01_sfnt_off0000ff40.bin
5eb4deebf9c66d1bd5db311418eff91201156a74a1c3ae9604123f825b9c5d62
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF40 10820 bytes