Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7b210a61c2fb213…

MALICIOUS

PDF

78.0 KB Created: 2021-03-17 06:56:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 77b547aa62d0296fc4bdf2fd225e8222 SHA-1: 5199909cf95081643e4010d6187abe505c318f17 SHA-256: d7b210a61c2fb2133f9eb823fcbce70b260d6e3ef97672f3414ae0da9625df9f
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, indicating a high likelihood of malicious intent. The embedded URL points to a domain associated with phishing or malware distribution, disguised as a document related to 'incentive spirometry instructions'. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDFs from web content, further supporting the lure-based attack pattern.

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://nipisod.ru/award?keyword=incentive+spirometry+instructions+pdf
    • http://montana-media.com/duwedusovujakenewojixiwur40vy.pdf
    • http://load-bcp.com/las_vegas_travel_packages_from_south_africaiszzj.pdf
    • https://cdn.sqhk.co/gikokimofegi/Lhbiegd/supposedly_meaning_in_bengali.pdf
    • http://arthromedro.xyz/what_are_the_hours_for_walmart_todayrt9kr.pdf
    • http://ig-socialmedia.xyz/tedesunodojoruvilavhev51.pdf
    • http://veronaital.space/how_to_pair_onn_wireless_headphones_to_ipad8u6f9.pdf
    • http://naturebiolog.fun/como_hacer_un_estudio_de_viabilidad_sencillob64fz.pdf
    • https://cdn.sqhk.co/xajegakagiz/LhbO8ih/stockyards_fort_worth_texas_hotels.pdf
    • http://moitender.org/44990632320ik3vi.pdf
    • http://topchambre.xyz/xozujirowajovabadexefv170.pdf
    • https://cdn.sqhk.co/kukisigafumi/43rjfjN/kemiputejeze.pdf
    • http://natfreshik.fun/17394438318xd351.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/ba1721f3-64be-4702-8b68-3948fdff0957/rapajusapawelifiwes.pdf
    • https://22449060-8e30-4723-8828-967625cce342.filesusr.com/ugd/eddc50_6be98f4554b243d290e051a1dd6a96ff.pdf?index=true
    • https://uploads.strikinglycdn.com/files/8b33a273-d16f-4ead-bb68-9ae0b01b48d3/16274766311.pdf
    • https://uploads.strikinglycdn.com/files/27d70060-3b97-497b-8c92-1143f07c9f45/39198016324.pdf
    • https://uploads.strikinglycdn.com/files/a5e005a0-0a98-4a67-b417-442376cf3699/vivila.pdf
    • https://8b83d164-5e56-46cc-b941-48f48810ddf3.filesusr.com/ugd/76ce43_6fd70d5ff2dd4de097b022989d07f7e8.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_off0000f3ec.bin
9972024f4d24d406215bedcc548e289e194860881f7aefe72f66c3c0375f8cc3
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EC 5156 bytes
font_01_sfnt_off00010577.bin
8e4f7156c4455441c714804298a466d966cd6f3a9539eebe6d55e305004415f1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10577 11244 bytes