Malicious PDF — malware analysis report

Static analysis result for SHA-256 606d0160828124fc…

MALICIOUS

PDF

68.8 KB Created: 2021-03-25 13:40:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 9a90096120b7c4042b997946ebbb6ad1 SHA-1: 189c8bd7f59a2c423a1eb532fb241e17e13749f6 SHA-256: 606d0160828124fca8ba9572792a4a9761deaf2fc09f4dcc7a09636e5fb4ca2e
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable hosting, suggesting a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or a scam. No scripts were extracted, but the PDF structure itself facilitates the attack by hosting external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mezovuduw.ru/award?keyword=world+geographical+map+pdf+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4380543/normal_603a2437a8458.pdfIn PDF document text
    • https://cdn.sqhk.co/tekemozuj/bUk4iGm/tiny_worlds_of_wonder.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490529/normal_5fe5e685f2ef0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413242/normal_604df1c4d7098.pdfIn PDF document text
    • https://cdn.sqhk.co/jibezilesu/jhyjeeC/bike_racing_games_download.pdfIn PDF document text
    • http://solimixomi.iblogger.org/vunitaxite.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458854/normal_5ff9047c15111.pdfIn PDF document text
    • https://cdn.sqhk.co/gepabafi/v8PAhef/pact_application_form.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490251/normal_6055f0b5e9da1.pdfIn PDF document text
    • https://cdn.sqhk.co/lanasido/MVijKjj/vufiparuxanuxonuxun.pdfIn PDF document text
    • https://cdn.sqhk.co/zibomevuguli/hj02agg/junilog.pdfIn PDF document text
    • https://cdn.sqhk.co/gorisaburo/hbVLid2/33947862585.pdfIn PDF document text
    • http://vizubezawuz.iblogger.org/carbohydrates_biochemistry_mcqs.pdfIn PDF document text
    • https://cdn.sqhk.co/wenegifuteg/hcibUBI/jojularafurotepusupem.pdfIn PDF document text
    • https://cdn.sqhk.co/wiberini/EjaheN1/inspirational_film_quotes_disney.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://midabufab.rf.gd/96246250320.pdfIn PDF document text
    • http://zatesivixif.epizy.com/givanujuxutubafi.pdfIn PDF document text
    • http://gorevifero.epizy.com/mijatamesuni.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_off0000d001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD001 5496 bytes
SHA-256: 94e40266ee21772e158c05cc9f0a76fd48e4d9bacd574f552b35813b3aebdb16
font_01_sfnt_off0000e2a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A1 10400 bytes
SHA-256: d137fa92d7e9a5a5e5ed87d77fceaedd6069bd89eca19af8df405a28060f23b7

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