Malicious PDF — malware analysis report

Static analysis result for SHA-256 b50b6a0dd67c081a…

MALICIOUS

PDF

80.1 KB Created: 2021-03-16 10:57:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9a9c17319664de049d1f5543973a807f SHA-1: bf11215543b025a30b56d3d9f2b20917f1ac5187 SHA-256: b50b6a0dd67c081a9478f8b1b210eae8659a2906d1adb816b8f29209ddbbc2b2
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, specifically as a phishing trojan. It contains an embedded URL pointing to 'jacksth.ru', which is likely used to deliver a malicious payload or redirect to a phishing page. The PDF structure itself is also flagged for suspicious object definitions, indicating potential obfuscation or malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/wix?keyword=citizen+skyhawk+at+manual
    • http://xxlmature.site/twilight_saga_breaking_dawn_full_movie_in_hindi_free_download_720p7yvfz.pdf
    • https://cdn-cms.f-static.net/uploads/4415936/normal_6024c36f93077.pdf
    • http://amandeepsadyora.com/social_learning_theory_definition_criminology5g8m0.pdf
    • http://trylait.club/529064118381j62g.pdf
    • http://vashastrahovka24.ru/woxavisagawezivowukiwrt8gw.pdf
    • https://cdn-cms.f-static.net/uploads/4480590/normal_601a02cbe070c.pdf
    • http://dlkmvkoenv.info/errata_sheet_formatprmap.pdf
    • http://clobuss.ru/mafezxkam0.pdf
    • http://worilura.22web.org/bemajusatojepuluvexesijov.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://zegemipufe.epizy.com/7550962652.pdf
    • https://uploads.strikinglycdn.com/files/5ddfc5be-2c63-40a7-96f1-874a6b8f16e2/liwunagodilapaxulunaxixad.pdf
    • https://uploads.strikinglycdn.com/files/3c1865d3-073a-4d03-99fd-c5002732cfcd/how_to_use_ge_oven.pdf
    • https://uploads.strikinglycdn.com/files/04d1b743-ad39-4817-bec8-051a974cb1d7/25474632379.pdf
    • https://uploads.strikinglycdn.com/files/1f156a73-730e-4d3a-a44e-8b80dae9864b/90428706090.pdf
    • https://uploads.strikinglycdn.com/files/f1bf2146-acce-4e44-9c9f-c88f4250a8e5/soleus_air_dehumidifier_gl-deh-70eip-6_pump_not_working.pdf
    • http://lafeseg.rf.gd/arcade_racing_games_pc.pdf
    • https://uploads.strikinglycdn.com/files/9419236a-ec03-45c7-9ec4-e1121e07cd4e/romusazisulu.pdf
    • https://uploads.strikinglycdn.com/files/1ea863c3-9329-4cc8-9b3c-76a8e46ca72d/roku_xd_remote_not_working.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0c0.bin
6ea39dc854036ddd372a9ab47676546f398a3f41b9979ae15890c055d488eee4
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C0 4932 bytes
font_01_sfnt_off00010178.bin
cd652ab85e1dabdf93281c2b2cd94643087c648ae2308a5578c2cdef49d37074
pdf-font-stream PDF embedded font (sfnt) at offset 0x10178 10316 bytes
font_02_sfnt_off000124cb.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34
pdf-font-stream PDF embedded font (sfnt) at offset 0x124CB 4324 bytes