Malicious PDF — malware analysis report

Static analysis result for SHA-256 aced8e9b73611bdf…

MALICIOUS

PDF

77.2 KB Created: 2021-06-14 13:26:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 26b1174cb7f64b86cc81d7f6036d945e SHA-1: 68124343adbf4ac517a37d32e3dd67a75801a59f SHA-256: aced8e9b73611bdf37e4e3ec7d7d24ff6f52e0a5a6e12f3d5223378e50631d39
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and one specifically to 'queure.ru' which is flagged as malicious. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to a malicious site, possibly for credential harvesting or further payload delivery.

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://queure.ru/pbw?utm_term=balancing+chemical+equations+pogil+activity PDF link annotation
    • https://joxujodeli.weebly.com/uploads/1/3/5/4/135400218/2121358.pdfIn PDF document text
    • https://gavivexov.weebly.com/uploads/1/3/4/6/134667590/3835283.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://wenuveraroto.pbworks.com/f/37829010420.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9a116fb-e197-4564-bc2b-e25798e94cff/c_yellow_book_2019.pdfIn PDF document text
    • http://jeselivid.pbworks.com/f/engineering_mechanics_dynamics_13th_edition_solutions_manual_free.pdfIn PDF document text
    • http://befurapebora.pbworks.com/f/kevomuxosowapafaxulorexi.pdfIn PDF document text
    • http://garigor.pbworks.com/w/file/fetch/144427533/test_ingresso_bocconi_2018.pdfIn PDF document text
    • http://minuwaxiper.pbworks.com/f/sorabidofubetol.pdfIn PDF document text
    • http://dibotoge.pbworks.com/f/pulakawim.pdfIn PDF document text
    • http://bemulopawed.pbworks.com/f/exercices_maths_exponentielle_terminale_es.pdfIn PDF document text
    • http://lekipirunezi.pbworks.com/w/file/fetch/144618708/volvo_penta_d2-55_workshop_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6733b45d-5a91-4ca5-b4ca-f94052451794/51993184627.pdfIn PDF document text
    • http://varulemenel.pbworks.com/f/vutidetibinemeboxekabuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10d44a2d-3ac4-486d-9f97-d3e61f5cd528/database_management_software_is_considered.pdfIn PDF document text
    • http://reravupavad.pbworks.com/f/on_movies_live_tv_app_download.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF24 5472 bytes
SHA-256: 89825325a79bcfc1f5e597856629935e5a8a18163393aa820304b119f9c706b4
font_01_sfnt_off0000f19c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19C 11912 bytes
SHA-256: c8c9d9814ee0ae594c8ec7cbd96a8146cd63a332516b16e9b98c9e8efe01e16e
font_02_sfnt_off000119c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119C0 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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