Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c00ff9928251351…

MALICIOUS

PDF

120.6 KB Created: 2021-03-04 07:05:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: f7fbbdd34d47e6b5ff499f31275f96ff SHA-1: 36c2b8bb6e9c2ea7086c1ca7491f7f2aaf283bed SHA-256: 1c00ff99282513510c05b17cdcf1b75277d2b05bb44d51faf98adae3e01f3e09
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. It contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and embedded URIs strongly indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://kuzutuzo.ru/award?keyword=what+verse+is+the+serenity+prayer PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4492880/normal_600e8475ed0a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407991/normal_60100197b202a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381964/normal_60099e88b2bce.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387061/normal_5feba992e144e.pdfIn PDF document text
    • http://misiliv.66ghz.com/acer_aspire_5750_p5we0_drivers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427105/normal_602f9e92e5f68.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473618/normal_5fec8ccdf4200.pdfIn PDF document text
    • http://dapajurop.mygamesonline.org/ripemaxiw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474169/normal_5fd9626b7a296.pdfIn PDF document text
    • http://zutolewe.mywebcommunity.org/nesco_digital_pressure_cooker_manual.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374521/normal_5ffae539d5341.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418170/normal_6014ab35219d6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://firiviwitike.epizy.com/dj_krishna_bhajan_mp4_song_free.pdfIn PDF document text
    • http://lipabarud.atwebpages.com/7958358538.pdfIn PDF document text
    • http://tekunobujolid.epizy.com/ashokan_farewell_guitar_sheet_music.pdfIn PDF document text
    • http://wonegesaf.epizy.com/clash_of_clans_pc_windows_10.pdfIn PDF document text
    • http://juwelaloz.epizy.com/android_studio_flutter_shortcuts.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_off00019b1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19B1E 5048 bytes
SHA-256: 6133d5256917d352b777659ccba7a02ca4c0563ccdd8473d87c5fe973fe7602f
font_01_sfnt_off0001ac5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AC5D 12536 bytes
SHA-256: 63eb62c21f353f30c8fe956ca55bb714e2291be86f302f4f34d167da5ee3bafd

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