Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0fd23f387911d42…

MALICIOUS

PDF

73.5 KB Created: 2021-03-11 23:50:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cccb4c9258742aaa7b3cfd9d002f95be SHA-1: 763e53544ec641440e0588099277415b898d41be SHA-256: b0fd23f387911d42379e04083eb32d66835f9e3d8a384fba081c8f5c22d3b72b
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 as a phishing trojan. It contains an embedded URI pointing to 'jacksth.ru', which is likely part of the phishing lure. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to exploit vulnerabilities or trick users into navigating to malicious external resources.

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/award?keyword=electrical+building+services+design+pdf
    • http://wifisef.medianewsonline.com/77465497082.pdf
    • https://cdn.sqhk.co/jimumakevaji/hejiK1U/fidologojaso.pdf
    • https://furetexagorude.weebly.com/uploads/1/3/5/9/135958868/f99c72b1.pdf
    • https://cdn.sqhk.co/purizepore/ggBhbLn/empire_warriors_tower_defense_td_strategy_mod.pdf
    • https://burufazifefep.weebly.com/uploads/1/3/4/5/134584298/wutesiboxolure.pdf
    • https://mowazaxof.weebly.com/uploads/1/3/4/7/134704653/e00a166057.pdf
    • https://static.s123-cdn-static.com/uploads/4496810/normal_5fc5ca05a61f5.pdf
    • http://xeresorejal.iblogger.org/ardaas_karan_full_movie_2019.pdf
    • https://cdn.sqhk.co/pedidagow/igHbihk/43361590863.pdf
    • http://rivepozepuxar.mywebcommunity.org/onkyo_remote_volume_button_not_working.pdf
    • https://xuvivodoxanujo.weebly.com/uploads/1/3/5/3/135308848/zokej-bidegetisebopak-juwapav-lugafar.pdf
    • https://static.s123-cdn-static.com/uploads/4476273/normal_5ff4734337a67.pdf
    • https://ledajesaler.weebly.com/uploads/1/3/4/0/134041179/5977752.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/rumezo/fargo_hdp5000_service_manual.pdf
    • http://rafegetomuzu.rf.gd/xabuvetutixet.pdf
    • http://fuxazulofonu.epizy.com/kifefo.pdf
    • http://zetiguseje.rf.gd/30703910254.pdf
    • http://molodetagako.epizy.com/zixoforimebirudije.pdf
    • https://s3.amazonaws.com/nazekisigiduz/pawodorisafi.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_off0000e2a1.bin
9245530f790014295ab55012690b08fe68c3e7f5d42ec2cfec50b1086b7b516e
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A1 5480 bytes
font_01_sfnt_off0000f558.bin
68cbdb6d02f349a9d88f2286294670c288a1983b1ec18bc07f49d5b761978f8a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF558 10484 bytes