Malicious PDF — malware analysis report

Static analysis result for SHA-256 85def73d7d614ff0…

MALICIOUS

PDF

79.7 KB Created: 2021-02-23 18:15:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 43df91c774478f166184f95db6eff6ea SHA-1: f1ef987f174a629af03d0078286dbef10b7986f3 SHA-256: 85def73d7d614ff0688ceaf2afc4c24f10056399ce46cc1e86016fb9f7b38811
184 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, and contains links to known malicious redirector infrastructure. The embedded URLs and the document's structure suggest it is designed to trick users into visiting a malicious site, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=practicing+active+and+passive+voice+worksheet+answer+key In PDF document text
    • https://static.s123-cdn-static.com/uploads/4465392/normal_5feb8e1a37b02.pdfIn PDF document text
    • http://bonboxstudio.com/tawave5lbk7.pdfIn PDF document text
    • http://toppiksnack.xyz/rezaruvutezakefawuwabeux8r.pdfIn PDF document text
    • http://ital-tess.space/boite_en_papier_origamioxnib.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409255/normal_6016f41ae5535.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424011/normal_6012c30bb2419.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412894/normal_60289583c4443.pdfIn PDF document text
    • http://repair-foto.ru/pharmacokinetics_made_easy_birkettpmuqq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476127/normal_5fedf73d23f89.pdfIn PDF document text
    • https://cdn.sqhk.co/jazepoxamib/ffIG5ij/mukuxunusukivumubewob.pdfIn PDF document text
    • https://cdn.sqhk.co/jakufomego/3iehfQr/vice_city_gangster_download_for_windows.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483586/normal_5fcc495c0ff91.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dedinavesute/bourbon_reforms_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/bejenosugede/nadanab.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_off0000fa6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6E 5624 bytes
SHA-256: 880dfb26032aaf8d6987700a9aa3f5e5f19faa7899aa1410f71c96fa1f7572a8
font_01_sfnt_off00010dae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DAE 10584 bytes
SHA-256: 472fef17ba6b9e9f15c45c42ed2bf1b134ca00b1636ddeccbb78d764f0f94bd5

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