Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4e747c4359e0c73…

MALICIOUS

PDF

74.0 KB Created: 2021-02-18 02:40:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 64159b4635bf9767ff889cce5ffb9ae6 SHA-1: 34010bbf29ff8c91e2880e765ae9e454c042d8f1 SHA-256: f4e747c4359e0c73bd3d8860024c951c47ba7211d279789ad9fd426e36d9000c
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 URL pointing to 'jacksth.ru', which is likely the primary destination for the malicious payload or phishing content. No scripts were extracted, but the presence of an external URI and the ML/ClamAV detections strongly suggest a phishing or malware delivery attempt.

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/strik?utm_term=ashton+irwin+height+and+weight
    • https://cdn.sqhk.co/dasewugiru/fieyjgj/wijakezevofumub.pdf
    • https://static.s123-cdn-static.com/uploads/4411512/normal_5feb50a30ee0a.pdf
    • http://powusonuruw.22web.org/letter_format_in_marathi.pdf
    • https://cdn.sqhk.co/sezelijimofi/nMigLZF/edit_gmail_calendar_on_iphone.pdf
    • http://silikidabog.22web.org/45510687778.pdf
    • http://jebumivusesujan.iblogger.org/todokafu.pdf
    • https://cdn-cms.f-static.net/uploads/4444649/normal_601b974e1b9c3.pdf
    • https://static.s123-cdn-static.com/uploads/4476780/normal_60036d9d08e89.pdf
    • http://jabisoj.22web.org/parureminabomeje.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://dusiwesidixe.epizy.com/kp_tevta_form.pdf
    • http://reronagut.epizy.com/aankh_mare_song_bestwap._life.pdf
    • http://numivonef.rf.gd/nadomarenezenin.pdf
    • https://s3.amazonaws.com/xotomisen/39881740606.pdf
    • http://vugapadilubokis.epizy.com/lisbon_portugal_travel_guide.pdf
    • https://s3.amazonaws.com/vonusirukete/gpu_architecture_book.pdf
    • http://kedipakusox.epizy.com/89417713400.pdf
    • http://lazumibuwa.rf.gd/daliwobetowadofuwavevizin.pdf
    • http://zanevijid.epizy.com/60082291690.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_off0000e40b.bin
18988144953d1ada86d3e6186c7a170eff4478b6130405fe7b20225cd6f4ca6b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE40B 5136 bytes
font_01_sfnt_off0000f58d.bin
c852d99402383d92aabb58098aca344f7a46f4db63bee45a3e04f05ac23d3706		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF58D 11032 bytes

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