Malicious PDF — malware analysis report

Static analysis result for SHA-256 91973c853f5deda3…

MALICIOUS

PDF

77.3 KB Created: 2021-03-23 10:36:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: fbf4f236cd67a0b7edc13331dbdb4f4b SHA-1: 20680a425ce0cc42d1fa2f5113b708fefd7bab02 SHA-256: 91973c853f5deda3e0b9e29a3e9219d982c77cb04186380659df683c406758e4
166 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains numerous embedded links pointing to external domains, suggesting a phishing or malware distribution attempt. The presence of 'utm_term' parameters in some URLs indicates tracking, common in phishing campaigns. No scripts were extracted, but the overall structure and URL distribution strongly suggest a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://fokemale.ru/strik?utm_term=hunter+fan+remote+control+troubleshooting+99122 PDF link annotation
    • http://cuzinfo.ru/summer_escapes_pool_cover71tcl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393508/normal_6052bb2a3bf73.pdfIn PDF document text
    • https://cdn.sqhk.co/buganixezu/iheqjgk/68332948458.pdfIn PDF document text
    • http://nncucuucuc.space/xumogexasaxanowuvaxulmwhw2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494432/normal_5fe9b4690b1fe.pdfIn PDF document text
    • http://mscredit.info/memabetejopigupomudy5l9c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377679/normal_6047d9dc71eaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393018/normal_60475eafa8b2c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379849/normal_5fdc7f71ab2d1.pdfIn PDF document text
    • http://betijeduw.getenjoyment.net/dodge_ram_2500_parts_list.pdfIn PDF document text
    • https://cdn.sqhk.co/ragejeli/hi7gfjg/black_men_s_curly_hairstyles_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373502/normal_60542e3cc7f5a.pdfIn PDF document text
    • http://zonerokemub.getenjoyment.net/canon_mg3520_service_manual.pdfIn macro / runtime command snippet
    • https://static.s123-cdn-static.com/uploads/4487906/normal_5ff5b09d01de5.pdfIn PDF document text
    • https://cdn.sqhk.co/fovipobex/E7cphgh/17761080936.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471253/normal_5feb3ce29ffcf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploaIn macro / runtime command snippet
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c02a3fa2-970f-4384-b4fa-7a60184a1b73.filesusr.com/ugd/1da3fe_ee7379e59c5040d998419d0d16774038.pdf?index=trueIn PDF document text
    • https://85d2c5a2-fc31-4f76-86b4-4ebe2abe2bf4.filesusr.com/ugd/a8cc01_a3e4a1eae32f4ff1ae5671c4cdd42e46.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_off0000ef85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF85 5736 bytes
SHA-256: 5c6ee6f4c8e344c6e19a0561e8406b21ada8fa0ef523a444fdb8eeba0c8fa5ee
font_01_sfnt_off000102e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E1 10772 bytes
SHA-256: 0ef540f2b7887b7d5fc28cf749fe459ba539d68963c1607c8a75dba8a2e61492

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