Malicious PDF — malware analysis report

Static analysis result for SHA-256 259d217a4a3acc4d…

MALICIOUS

PDF

76.7 KB Created: 2021-04-01 23:46:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 174e57e7690a3b124ca2f6f4d8706027 SHA-1: c94c2844dcde236d79d4f8fbbe70544eb9a00d41 SHA-256: 259d217a4a3acc4d0fc76b0f82b08ca178c5668dd656f0ca815bf834fd348393
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one prominent URL pointing to a 'survey bypasser' keyword, suggesting a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to potentially harmful websites.

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://ponafet.ru/wix?keyword=survey+bypasser+2020 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4475382/normal_602ab688c2838.pdfIn PDF document text
    • http://famozosivupiwij.sportsontheweb.net/donutawumituxufo.pdfIn PDF document text
    • https://cdn.sqhk.co/noxisoture/hiPjir0/circuit_electrique_maison_individuelle.pdfIn PDF document text
    • https://cdn.sqhk.co/zamokaxu/iijjq68/was_kursk_the_largest_tank_battle.pdfIn PDF document text
    • http://fukiwurezopukof.mywebcommunity.org/ielts_reading_actual_test_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467573/normal_602ee799cf372.pdfIn PDF document text
    • https://cdn.sqhk.co/fusozuwalas/Unhc1eF/22001759024.pdfIn PDF document text
    • https://cdn.sqhk.co/fuwunikuneg/hgjgq1E/pounds_to_ounces_conversion_chart.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459468/normal_5fe12e04d4122.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445868/normal_60344f93810fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463825/normal_60184b5f9b90c.pdfIn PDF document text
    • https://cdn.sqhk.co/pixukinoma/fAxlFjj/game_live_streaming_apps_for_ios.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wazipegemezen.atwebpages.com/macam_macam_abnormal_gait.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e5e8c3a-6d1d-4f38-a5d0-87fd434376a8/558361293.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e78f792-ef6e-4818-93d9-584e7efdcd37/zejikuwutikaxozesazo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08ebb6a2-e0b2-4757-b610-02d0be82ad0a/brady_bmp21-lab_label_printer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3fbf0d0-7cec-415e-92ef-a6647f60f5c9/nobafozupivemewisoz.pdfIn PDF document text
    • http://pidodexogejax.myartsonline.com/24700018410.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d0ff567-be32-43d0-bf6b-9dd94be88fb7/batman_death_in_the_family_2020_full_movie.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_off0000ee77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE77 5460 bytes
SHA-256: 94912a932dbb641913e0322120ce6c80b254bb96b242997d9873fb3aa946e867
font_01_sfnt_off0001011a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1011A 10592 bytes
SHA-256: e51de3f5dfdaf1b1b65b8648e143035134dada649963680928ab6f676fdd8bc0

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