Malicious PDF — malware analysis report

Static analysis result for SHA-256 33e3eba5fa5314ec…

MALICIOUS

PDF

77.8 KB Created: 2021-06-11 10:49:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 8be88e6a64edc5a283e7c4e20ecd5cf0 SHA-1: aa72a5b46acfd6ad021fc98882adf4cb7dcbb7c9 SHA-256: 33e3eba5fa5314ec1af3d47ff938428ee26b04a5a1ce854518efc3002540e50d
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, a common tactic for phishing or distributing malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

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://nipisod.ru/123?utm_term=financial+reporting+cpa+forum PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4376599/normal_6060acea5d0de.pdfIn PDF document text
    • https://xakuwije.weebly.com/uploads/1/3/4/3/134340554/maboforav_favafijexofu_tosijexasob_sojib.pdfIn PDF document text
    • https://penabapemuzoji.weebly.com/uploads/1/3/1/4/131453208/sixipav_ruzovilo.pdfIn PDF document text
    • https://jepololazatozuj.weebly.com/uploads/1/3/4/6/134601538/4573199.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366628/normal_606530319248e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370302/normal_601ec11957411.pdfIn PDF document text
    • https://valexipeval.weebly.com/uploads/1/3/0/7/130775413/sazusovobom-zatesozeluki.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483587/normal_5ff3d35167d55.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476416/normal_605bee3ccd9f0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376619/normal_5fcd2f8d17a7c.pdfIn PDF document text
    • https://vavepinabuma.weebly.com/uploads/1/3/5/3/135303395/8247558.pdfIn PDF document text
    • https://leboxinadevot.weebly.com/uploads/1/3/4/4/134440814/7713996.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://puzavofan.pbworks.com/f/are_the_starlink_satellites_visible_tonight.pdfIn PDF document text
    • http://rajejor.pbworks.com/f/53571161607.pdfIn PDF document text
    • http://varulemenel.pbworks.com/f/bhagwat_geeta_as_it_is_download.pdfIn PDF document text
    • http://tefimemovem.pbworks.com/f/dls_2020_hack_free_download.pdfIn PDF document text
    • http://jeveriwilum.pbworks.com/f/balun.pdfIn PDF document text
    • http://wusajigi.pbworks.com/w/file/fetch/144730134/jilawimodi.pdfIn PDF document text
    • http://xumefosux.pbworks.com/f/vnon_psn_mp3_ke_staen_zdarma.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_off0000f40f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40F 5112 bytes
SHA-256: a5d4992b06b66806a31363a0497198a9b8c98754fd30a6a4de56178dec51ceec
font_01_sfnt_off00010569.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10569 11048 bytes
SHA-256: 9211a3d7e3fcd69ce07c845872c9fb912bc633cd0a3a98b8d2959b9d021e3a02

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