Malicious PDF — malware analysis report

Static analysis result for SHA-256 691f37f2d1ab46dc…

MALICIOUS

PDF

69.6 KB Created: 2021-01-30 00:55:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 9442dddd4505513ed2187e67b8049703 SHA-1: ea56dd891172dde704f71bee596d9777b392409d SHA-256: 691f37f2d1ab46dc87d51bda448c17f2943e1d0f910b933d8cec5394bc6c249c
126 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 it's a phishing or trojan PDF. The PDF contains numerous embedded URLs, many of which point to disposable hosting or link farms, suggesting a phishing or redirection scheme. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious intent to redirect users to potentially harmful sites.

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://jottigo.ru/123?utm_term=are+extreme+sports+worth+the+risk+pros+and+cons PDF link annotation
    • https://cdn.sqhk.co/vawikepaf/gidGjgz/gukabu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421944/normal_601491467167c.pdfIn PDF document text
    • https://cdn.sqhk.co/taxosavasesa/bjegcgj/om_nom_run_online.pdfIn PDF document text
    • https://cdn.sqhk.co/fabozesemi/pjdNgdZ/95082993676.pdfIn PDF document text
    • http://vivadoctor.ru/vedapodefifegakabenz19le.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467274/normal_5fe0340757d1c.pdfIn PDF document text
    • https://cdn.sqhk.co/datolabevev/Bhbrjed/castle_of_illusion.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379839/normal_5fd83e5f7719b.pdfIn PDF document text
    • http://setofexperience.site/6377504206y9jhj.pdfIn PDF document text
    • http://vewedomodisex.22web.org/71866582177.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gulavofi.epizy.com/53536742519.pdfIn PDF document text
    • http://saritimiramig.rf.gd/calendar_2019.pdfIn PDF document text
    • http://vavesimor.epizy.com/posujodutunujubumamit.pdfIn PDF document text
    • http://pijularof.epizy.com/antrian_paspor_manual_bandung.pdfIn PDF document text
    • http://gofirog.epizy.com/bombay_dyeing_cartoon_double_bedsheet.pdfIn PDF document text
    • http://pixutixiziv.epizy.com/9670610093.pdfIn PDF document text
    • http://kepinud.rf.gd/2006_mustang_auto_to_manual_conversion_kit.pdfIn PDF document text
    • http://lowoxewepabetex.rf.gd/27894856484.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_off0000d431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD431 5492 bytes
SHA-256: 4e4abdc4a77cc48a76dfd08335cb9d8d3f02eec7881dde0089dea10a9e7fa345
font_01_sfnt_off0000e6ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6CA 10148 bytes
SHA-256: 530c50ac2236805c10dd6e804cef3a46929e49748aafd5869ee6002f007be4df

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