Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8079adafefb2955…

MALICIOUS

PDF

90.3 KB Created: 2021-03-02 01:08:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: f1066774fdac7066577f18ba1ad5841a SHA-1: 77d57d6ba6d57fb4e589a0dfa6bcf7ca5611902a SHA-256: f8079adafefb29556e4678d99097805016ddc68eecebebc2744d14b7e1729a93
126 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 a large number of embedded URLs pointing to disposable domains, indicating a link farm designed to redirect users to potentially harmful content. While no scripts were explicitly extracted, the presence of numerous external URIs suggests an attempt to lead the user to a malicious site, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://lozipotod.ru/strik?utm_term=ignoring+base+rates PDF link annotation
    • http://wixosefimaba.scienceontheweb.net/mixazidoguledogap.pdfIn PDF document text
    • http://fruitslope.online/wool_hugh_howey_downloadloouw.pdfIn PDF document text
    • http://giocodigital.fun/vesufefimasizo7zvgo.pdfIn PDF document text
    • http://kozevajalun.22web.org/iowa_fight_song_sheet_music_clarinet.pdfIn PDF document text
    • http://getveran.site/51373784667fussz.pdfIn PDF document text
    • http://mmuuue.space/10496996499nem0k.pdfIn PDF document text
    • http://jidokove.scienceontheweb.net/what_is_modbus_tcp_ip_communication.pdfIn PDF document text
    • https://dijodiruji.weebly.com/uploads/1/3/4/0/134097483/zuduwudurowij_mibavemul_rodew.pdfIn PDF document text
    • http://tijudiwulewanuw.getenjoyment.net/burger_king_allergy_menu_nz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480397/normal_5ff1940ebaae0.pdfIn PDF document text
    • http://catsism.com/why_is_my_scalp_itchy_in_one_spot75ze1.pdfIn PDF document text
    • http://vawuzusodiguse.iblogger.org/96770390669.pdfIn PDF document text
    • http://summerita.fun/30916935617ygxvk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tuwutexo.onlinewebshop.net/gubukogabeke.pdfIn PDF document text
    • http://xizabefozuk.rf.gd/mexob.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010d85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D85 4896 bytes
SHA-256: 6e8bf4577242b33da63a4daf0baf0e608949e4a6720a4306df204248bccf26cb
font_01_sfnt_off00011e3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E3F 12100 bytes
SHA-256: fc8f00091081d9c455f077de56e0e28712b7e5ebbef3545344b3216dcd245a3e
font_02_sfnt_off00014740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14740 16060 bytes
SHA-256: eccb4a4e23ec17ef3ae34a7e59b2b3ca0bade477786653c37f50dbc176102729

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