Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4da7210316d482f…

MALICIOUS

PDF

76.4 KB Created: 2021-03-01 00:59:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 5b276b53b9bc447d2d0e1b48062970be SHA-1: d82e9a9855aa346a8151269fba597e21a2584cc9 SHA-256: a4da7210316d482fd906019ae94122e717be644d0c16ea0618e1cbbc3e9faab4
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or redirection scheme. The document body, though partially corrupted, appears to be a lure related to a search query, directing users to external sites like botokaw.ru.

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://botokaw.ru/award?keyword=what+are+the+three+factors+that+affect+seawater+density PDF link annotation
    • http://7lessons.fun/69374605047iaaqg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412588/normal_5ff90433db48f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403537/normal_5fd0e74898a60.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466368/normal_601b0460ac2b1.pdfIn PDF document text
    • http://itanto.space/samsung_m283x_driverjxz2v.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381083/normal_60325e3a209e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379229/normal_5fd1665e71736.pdfIn PDF document text
    • http://sodaapp.club/pakozosutaduvnvd0.pdfIn PDF document text
    • http://coloradocustomelectric.com/27875963060k2vnx.pdfIn PDF document text
    • https://cdn.sqhk.co/logubaxe/fjajcgd/tanesigonexirijizubimor.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421217/normal_5ff791a3c8e78.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460231/normal_602c01d5b35fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371498/normal_5fdc11d48a81f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bavatesivo.myartsonline.com/hunter_programmable_thermostat_44110_manual.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_off0000ecdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECDB 5284 bytes
SHA-256: 7fc85a2f1ada81dc6d634b279e997c52ac536961d530b334e46f426e02b7ed32
font_01_sfnt_off0000feeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEEB 10812 bytes
SHA-256: 2c404dff6930e260832c0836fe7dda4ebcfe52d537bdfe71d39bea87bf31270b

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