Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2e82d05bb2032ae…

MALICIOUS

PDF

79.1 KB Created: 2021-03-11 16:31:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 99d323af29cf8e97b914d10d1fc4e1cf SHA-1: b8fd532a13f5a1aa2a21951bf60221d09d1a1d4f SHA-256: e2e82d05bb2032aed876b724553efc855a43e9660289149bf1e7ca784a84989f
96 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, specifically identified as Pdf.Phishing.Trojan. The presence of an embedded URI pointing to 'jacksth.ru' strongly suggests a phishing attempt or a distribution point for further malicious content. Although no scripts were explicitly extracted, the PDF structure and the nature of the embedded URI indicate an intent to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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/award?keyword=spanish+to+english+common+phrases+pdf
    • http://zhigina.ru/stein_and_shakarchi_complex_analysis_solutions_chapter_1osrl2.pdf
    • http://varnisvakq.ru/psat_math_test_no_calculator_answerstwtes.pdf
    • https://cdn-cms.f-static.net/uploads/4423715/normal_600ecf161f0da.pdf
    • http://rorafosuwis.22web.org/sigawoxofekexixugabun.pdf
    • http://kukuginori.22web.org/pojuruvoxafitozaxexete.pdf
    • https://static.s123-cdn-static.com/uploads/4392667/normal_5ff153ffb4bfb.pdf
    • https://cdn-cms.f-static.net/uploads/4421354/normal_6045fafef37a3.pdf
    • http://epaytds.xyz/2nd_grade_math_standards_virginiaax0z9.pdf
    • http://ruguwafe.scienceontheweb.net/83153488651.pdf
    • https://static.s123-cdn-static.com/uploads/4370055/normal_5ff025e15aa90.pdf
    • https://cdn-cms.f-static.net/uploads/4456998/normal_6049d11f6307b.pdf
    • http://copyright-helps-team.com/budunimevelozap3nw6k.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://a86a6b26-b473-4b55-b9aa-7628a2bff077.filesusr.com/ugd/4f270c_353fa36db2284bd88dce3c0b9bc4b32e.pdf?index=true
    • https://86f5e18a-8766-4ae7-b9bf-31430b627380.filesusr.com/ugd/911c12_b216fea11c614d3a934c6c3e5e0564e1.pdf?index=true
    • https://uploads.strikinglycdn.com/files/bacb039f-1904-4e81-82c3-cb3a4d274a2d/81011200118.pdf
    • http://xikisefux.epizy.com/android_16_l_meme.pdf
    • https://uploads.strikinglycdn.com/files/7cb302cb-b8fb-4bc1-a48b-3c2cb1e92312/why_is_my_nespresso_vertuo_leaking.pdf
    • http://tixofimisupabev.onlinewebshop.net/83391452880.pdf
    • http://pamerof.epizy.com/halloween_bingo_printable.pdf
    • https://uploads.strikinglycdn.com/files/f6bf324b-e33e-4b85-b74e-34571681c76f/how_to_have_zero_stomach_fat.pdf
    • http://kanuximus.rf.gd/how_to_use_bissell_ready_clean_powerbrush.pdf
    • https://9afb1793-bc57-4514-bb46-74e980466609.filesusr.com/ugd/11f207_1be414b87e414cbfa522250a1fdfbda2.pdf?index=true
    • https://uploads.strikinglycdn.com/files/73da7b2f-ae60-473c-8c3e-7ce0b2c7a411/sadenuxupuxixorudokefu.pdf
    • https://e82ff0bd-cb1a-4782-8b92-0a0fb7657660.filesusr.com/ugd/d17951_0f71ce4f94344348b0a4b4720a4f8cb5.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_off0000f838.bin
89414292c01f867bce62de44407a21af8e2f3f96cc7c51da6d4fd3484a96c74b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF838 5672 bytes
font_01_sfnt_off00010b60.bin
2130d787cd33a67b953afcadad44419b4e2ad1f41a8124c474933250212e5e8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B60 10436 bytes

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