Malicious PDF — malware analysis report

Static analysis result for SHA-256 d685f0aae61b214a…

MALICIOUS

PDF

77.8 KB Created: 2021-04-05 12:21:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 84be5bf8ec2fae29115b31e5a64ce66d SHA-1: eeb2185f995dd74d2a9b430d7dabaa3c1632319f SHA-256: d685f0aae61b214a6c57caa1667f014e84bed35ab202cf75d887d76199f6a2f7
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to suspicious or disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=c3+vs+c4+plants+pdf PDF link annotation
    • http://biolinkus.me/liftmaster_professional_1_2_hp_garage_door_opener_troubleshootingr4ual.pdfIn PDF document text
    • http://powerpoint4you.ru/dopibafutekakemunk8oab.pdfIn PDF document text
    • https://cdn.sqhk.co/lukapokobejo/hcHjfYh/twilight_struggle_ios_review.pdfIn PDF document text
    • https://cdn.sqhk.co/kuniremolu/gchahbb/racing_moto_3d_apkpure.pdfIn PDF document text
    • https://cdn.sqhk.co/vikojovowoso/gj9V4if/lilim.pdfIn PDF document text
    • http://lg-copyright.com/340204659493rz2d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425507/normal_604a50a7bde48.pdfIn PDF document text
    • https://cdn.sqhk.co/rumunefa/Zib3icp/telecharger_dictionnaire_anglais_francais_apk_offline.pdfIn PDF document text
    • https://cdn.sqhk.co/zegareguw/ggfgjY6/bubblegum_hero_online.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453907/normal_5ffe89ce7579f.pdfIn PDF document text
    • http://cmbmarketing.agency/steve_jobs_commencement_speech_worksheet9d000.pdfIn PDF document text
    • http://idealica-official-it.website/must_stops_road_to_hana6urc0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369165/normal_5fcebad6abe7e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zuwimadaneb/2118511952.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c18e49c-6ec5-42fa-b2d5-02a59907db0c/pit_bike_racing_classes.pdfIn PDF document text
    • https://s3.amazonaws.com/banula/c._v_writing.pdfIn PDF document text
    • https://s3.amazonaws.com/pajukovuxetu/munumak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b3e61a6-89d6-4f3d-b894-d99227a6ff6a/are_salons_safe_covid_19.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bde7434e-140c-4ba9-b78f-48171ca7fcc2/81829289539.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73ab6194-f3c1-41b7-939e-48858a035148/cadette_breathe_journey_ideas.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_off0000f28d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28D 5268 bytes
SHA-256: e0e9af26f7b7390b0381808e19fa528adb8e55bcb5767a19bfc01b457391e7d0
font_01_sfnt_off0001049d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1049D 11292 bytes
SHA-256: 968d5a3648371874f9efca3971389fbfc609c0d2d6fbef875695774648507678

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