Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf9236a7031f9aca…

MALICIOUS

PDF

74.3 KB Created: 2021-03-10 22:59:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: f16ce23ec7f63c8b8e7ba8eda159b92f SHA-1: 2115d796ea334f10fdde694d7856f9320845b39f SHA-256: cf9236a7031f9acadb2359592a534a590463e3c5a39a86dbf8617c8260d8961e
266 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File T1059.007 JavaScript

This PDF document is classified as malicious by ML models and ClamAV, indicating a high likelihood of malicious intent. The document body and heuristics suggest it acts as a lure, instructing users to interact with clipboard content in a way that could lead to command execution, likely to download a second-stage payload. The presence of numerous external links, many pointing to disposable hosting, further supports a malicious distribution or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 8

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://vilenefex.ru/award?keyword=deadpool+kills+the+marvel+universe+pdf PDF link annotation
    • http://subezatedi.iblogger.org/ice_cream_roll_machine_for_sale_uk.pdfIn PDF document text
    • https://pimesawugure.weebly.com/uploads/1/3/0/7/130776266/7378690.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478393/normal_60276bc2b3bfc.pdfIn PDF document text
    • https://vuvudosav.weebly.com/uploads/1/3/4/5/134579130/lorif.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366007/normal_5fffebc6d9ab6.pdfIn PDF document text
    • https://nudadisaxoge.weebly.com/uploads/1/3/4/0/134018155/xikijilakawezi.pdfIn PDF document text
    • http://copyrightsupporthelpcenter.com/windows_powershell_ise_3.0_downloadxdaxh.pdfIn PDF document text
    • http://aov.one/macro_calculator_excel_templaterdbgp.pdfIn PDF document text
    • https://raguwamirib.weebly.com/uploads/1/3/4/6/134630778/1925731.pdfIn macro / runtime command snippet
    • http://vsedlyatebya.xyz/materiales_aislantes_electricosh21di.pdfIn macro / runtime command snippet
    • https://cdn-cms.f-static.net/uploads/4495271/normal_600db15918d50.pdfIn PDF document text
    • http://aov.one/macro_caIn macro / runtime command snippet
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://54957a25-093b-4cbd-a4f0-8eb5fea931f0.filesusr.com/ugd/8ba634_7ced9c5896c8403eaafdd36e189e8fe3.pdf?index=trueIn PDF document text
    • https://728bf1be-24e3-4891-ba98-fedceca1a503.filesusr.com/ugd/3268c8_3173128c8fc34378a7a2f4f9b711e6ec.pdf?index=trueIn PDF document text
    • https://76a725e8-946c-4ae9-9249-cda469d35108.filesusr.com/ugd/83c8cc_734a796201e0425db659e5db98d42fc6.pdf?index=trueIn PDF document text
    • http://biwevugiwuk.epizy.com/77661114832.pdfIn PDF document text
    • http://kagilabitivibe.epizy.com/best_celebrity_family_feud_answers.pdfIn PDF document text
    • https://76ed6b59-b034-43ac-b949-e1c08f76e3cb.filesusr.com/ugd/ee6100_ac7430201d304c4d8c5f4ec5fe081033.pdf?index=trueIn PDF document text
    • https://f0ddeb88-3549-4a27-8821-6e3dd713f165.filesusr.com/ugd/2b74da_11802a7ef7c64b07b2b233c04b8ea369.pdf?index=trueIn 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_off0000e769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE769 5404 bytes
SHA-256: b48bf26dbb235f77fa8c633d95269df8e85567fa2a07cd0b0db5bb4999c00b70
font_01_sfnt_off0000f9ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AC 9924 bytes
SHA-256: 115ace5bf46eab4677d17812e920c2bb63761f7e4750fd7fb346705f2d8620dd

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