Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f24f0f45dd34dd4…

MALICIOUS

PDF

75.0 KB Created: 2021-06-06 07:18:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 525dee64b688c0dc55200260176cc7ac SHA-1: db1a6614f00626a0d262e8fe225b6d5987e53031 SHA-256: 9f24f0f45dd34dd47918a30c3e2b67d1bf86a69685ec0b7463545a4c82ea8285
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an urgency-based lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://coretry.ru/pbw?utm_term=turo+customer+support+number+usa PDF link annotation
    • https://fagutefoxod.weebly.com/uploads/1/3/4/2/134235025/jabadi.pdfIn PDF document text
    • https://zukamukenipebo.weebly.com/uploads/1/3/1/3/131380388/bb99ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368741/normal_606d0f17725b7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416305/normal_5fedc792e8b1f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451756/normal_5fc88286189a1.pdfIn PDF document text
    • https://fakimodixoto.weebly.com/uploads/1/3/0/7/130739088/kitogixutiditizoxati.pdfIn PDF document text
    • https://jadowusirufire.weebly.com/uploads/1/3/2/7/132740355/samujisawuputosari.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411700/normal_6058fb98b3f49.pdfIn PDF document text
    • https://bibeluwevolaru.weebly.com/uploads/1/3/4/4/134497964/8430416.pdfIn PDF document text
    • https://jutebipofan.weebly.com/uploads/1/3/4/3/134334370/tebej-gesudavute-tizinivus-texobax.pdfIn PDF document text
    • https://zuravenizojexex.weebly.com/uploads/1/3/4/3/134320774/gakotefumomitod.pdfIn PDF document text
    • https://mezikemopirexat.weebly.com/uploads/1/3/5/9/135993778/tosujemimofene.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418370/normal_601f568e60d3e.pdfIn PDF document text
    • https://fujulisu.weebly.com/uploads/1/3/4/0/134042697/bc2c021caed4.pdfIn PDF document text
    • https://rovupugefo.weebly.com/uploads/1/3/4/3/134359584/8983665.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://buvavipoluvu.pbworks.com/w/file/fetch/144424446/41790920659.pdfIn PDF document text
    • http://sikovifif.pbworks.com/w/file/fetch/144476856/what_is_nikes_competitive_strategy.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_off0000e776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE776 5136 bytes
SHA-256: 948414d938cd97ee2ab226c3a5204db9e17ef7a458bd5d2fbff53d390b74d945
font_01_sfnt_off0000f8cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CC 11260 bytes
SHA-256: cf1f68f1a94495c3f33e6118066290d9b273066d4bdfe0d4f2957adf01856fd7

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