Malicious PDF — malware analysis report

Static analysis result for SHA-256 58d01fb9e6129d11…

MALICIOUS

PDF

98.7 KB Created: 2021-03-22 19:15:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: d06479e9b192f059c04a26f6f79f1239 SHA-1: b8e947672ebecfd74ea5dff2edaa6b8abac09864 SHA-256: 58d01fb9e6129d1129f4fa85a65753e4575b94cf389ebb2c069006d9b29da6b8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple embedded URLs, with one specifically pointing to 'kuzutuzo.ru/award' which is flagged as suspicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or delivering a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://kuzutuzo.ru/award?keyword=basel+iii+pdf+2020 PDF link annotation
    • https://cdn.sqhk.co/kagelemovo/8oij8jb/57427991480.pdfIn PDF document text
    • https://cdn.sqhk.co/panazomuv/icPF1hf/70805540839.pdfIn PDF document text
    • http://pe50off.pro/xegodupuwavavevulijepugzw5i.pdfIn PDF document text
    • http://naturfresh.fun/39745007226st32b.pdfIn PDF document text
    • http://zekoselu.22web.org/rurasifanojimumuna.pdfIn PDF document text
    • https://cdn.sqhk.co/zatejurix/6VQz9Zy/neo_scavenger_map_locations.pdfIn PDF document text
    • https://cdn.sqhk.co/paleguvebo/djf2jfU/juwopogidata.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bazibataz.epizy.com/ir_spectroscopy_principle_instrumentation_and_applications.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5929b84-e6c4-496e-9ba5-aed182238639/63958062724.pdfIn PDF document text
    • http://ponaduzatofu.rf.gd/42388952490.pdfIn PDF document text
    • https://s3.amazonaws.com/somamere/fopofivu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18b694d0-7e8f-4079-a85a-19ada916efcd/cost_to_overhaul_lycoming_0-320.pdfIn PDF document text
    • http://zawagebojirowe.rf.gd/57700780143.pdfIn PDF document text
    • https://s3.amazonaws.com/borokegujuzero/21180213684.pdfIn PDF document text
    • http://tuzikarowom.epizy.com/xolametuxukikewoluxezeko.pdfIn PDF document text
    • https://s3.amazonaws.com/rewepalazamiso/nutigiwot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cae43fc-775b-4516-90d8-83227393a3c1/bill_bergey_lincoln.pdfIn PDF document text
    • http://rukanaka.epizy.com/28189763988.pdfIn PDF document text
    • https://s3.amazonaws.com/dinisemowoge/pusomalosorofopuvebud.pdfIn PDF document text
    • http://vorawaforase.epizy.com/auto_detailing_service_menu_template.pdfIn PDF document text
    • http://mowedesidafog.epizy.com/agenda_2020_19.pdfIn PDF document text
    • http://furalepoju.rf.gd/xirikidejipufinowemizite.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2e4edcf-9fcf-427e-80a8-fb1b29a0f5e3/zusafemutolilonetevaji.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000141db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141DB 5264 bytes
SHA-256: 4a67af7844b8b35c51be7ad47fcb9c85d1ec4b3cfa4f4a5d2a8ce9cfad638b9b
font_01_sfnt_off000153d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153D8 12092 bytes
SHA-256: 7e92ce3161207110a1b2b1387089524f6414a90dd68fa823d5faf332d43458b2

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