Malicious PDF — malware analysis report

Static analysis result for SHA-256 a98c99fcfe7dd92b…

MALICIOUS

PDF

66.4 KB Created: 2021-05-28 00:17:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: aaa45c2c5f1dce57732c52daab77ddd0 SHA-1: 2359edb2dbbd9552ff9fe0bbf36ee2f53de90c29 SHA-256: a98c99fcfe7dd92ba501af03fadac1c45ae697bb447ff69343d7f8ce0092bd79
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, many pointing to PDF files hosted on various platforms, suggesting a link farm or phishing operation. The presence of embedded URLs and the overall structure indicate an attempt to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 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.
  • 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://ponafet.ru/strik?utm_term=ags+pre+algebra+workbook+pdf PDF link annotation
    • https://peketavapi.weebly.com/uploads/1/3/4/3/134331612/63ac50ef124.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413696/normal_60146cc4d3dcb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446494/normal_5fffead8789a5.pdfIn PDF document text
    • https://gafujoneruxuf.weebly.com/uploads/1/3/4/7/134728567/4435b47a811.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383792/normal_604467dd1ecc6.pdfIn PDF document text
    • https://vimavopama.weebly.com/uploads/1/3/4/7/134769365/9676987.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419410/normal_605fa8ad5203d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415309/normal_60170494380b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410727/normal_60485e6560b38.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426960/normal_5fd62b87d692a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407085/normal_60272f3e210f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402963/normal_6014d7792ee35.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413119/normal_605c1957a9bdf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403118/normal_5ff61d17ea223.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495043/normal_5ffe6f09ea8d2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491969/normal_5feea48b850e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365624/normal_60229fd1e6959.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373517/normal_602291638d6ef.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ef7b470-a4f6-4e8b-8486-602a709904e4/star_wars_kotor_korriban_walkthrough.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/843a15c5-cd3a-450d-917e-3762073e448f/7456335507.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3197a71f-268d-42f3-ac17-3e4c21004b59/82692707986.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5788925-8c80-4be1-89cd-1951503be228/40657084584.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85fa78e8-d497-4fde-892a-76bd19bc6220/maxerevojovefegepi.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_off0000c883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC883 5492 bytes
SHA-256: 2dcb9b7a572efdfd77b3ca2372577b2f34a91afb3988a489731dca98873865ca
font_01_sfnt_off0000db54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB54 9688 bytes
SHA-256: 9fb14a2a7fa4314c6d505e8e20ad53ad0c5fd83415202df4965153d7ae714fe0

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