Malicious PDF — malware analysis report

Static analysis result for SHA-256 cab1312a0c08758a…

MALICIOUS

PDF

73.7 KB Created: 2021-02-27 06:22:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 43f887715dd58cc8d4649d3cc1d3782d SHA-1: 5fe3846c69493abee9da1e9cb98dfba09cb741de SHA-256: cab1312a0c08758a8cd923b464cd1c2c75eb326d896b8b652a0d271ddcf4383a
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one prominent URL pointing to 'jacksth.ru', suggesting it functions as a link farm designed to redirect users to potentially harmful content. The PDF's structure and the presence of external URIs indicate it is likely a phishing or redirection lure.

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://jacksth.ru/strik?utm_term=what+is+the+structure+of+a+protein+determined+by PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4376105/normal_60330f3682429.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480880/normal_6034fadd437dc.pdfIn PDF document text
    • http://berabufepibaj.iblogger.org/how_to_clean_a_burnham_gas_boiler.pdfIn PDF document text
    • http://joxorapux.22web.org/65589176087.pdfIn PDF document text
    • https://cdn.sqhk.co/porosobof/ghtgjif/ak_47_wallpaper_4k.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499319/normal_5fc9eb19819b6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389387/normal_5ff79d5f7fca2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380887/normal_5fd77f2eae9f8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427085/normal_5fcaa426edc14.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://larisakexifa.epizy.com/abiotic_vs_biotic_factors.pdfIn PDF document text
    • http://fepasike.epizy.com/90791617154.pdfIn PDF document text
    • https://s3.amazonaws.com/towutoginadivu/valewimezapidunan.pdfIn PDF document text
    • http://wewefaxekedafoz.epizy.com/indefinite_articles_worksheet.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_off0000e34c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE34C 5616 bytes
SHA-256: b545a4f29c97256d38297d633347a040c146a8f49f99869294976fbab3ba38df
font_01_sfnt_off0000f64a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF64A 10452 bytes
SHA-256: 54b8a6366f2db6e1a7ab5c1e4f0fbd18ba5f2819a62e8bf47b00c25d73d8ab1f

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