Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a9fa4cb79a0c660…

MALICIOUS

PDF

68.9 KB Created: 2020-11-26 08:15:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: a3b0e3c707a3bc4f56b13c90b5513df1 SHA-1: 09a599a5b62f7c2853c0e6b6108603a2074d700d SHA-256: 0a9fa4cb79a0c6609469492101f8ce49878985ffac637a90ae58ec9c41450327
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many of which point to other PDF files, suggesting a link farm or redirection mechanism. The embedded content, though heavily obfuscated, likely serves as a lure to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffset.ru/strik?utm_term=plato+allegory+of+the+cave+summary+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4493545/normal_5fbee6c56d334.pdfIn PDF document text
    • https://neseriduro.weebly.com/uploads/1/3/4/8/134851425/bagajonikef.pdfIn PDF document text
    • https://renalulawe.weebly.com/uploads/1/3/4/7/134735886/davenuma.pdfIn PDF document text
    • https://nidiladidubupa.weebly.com/uploads/1/3/4/7/134753920/vosukikoxizu_bodowis_nonomumitiruv_vomenox.pdfIn PDF document text
    • https://xiwofisenitew.weebly.com/uploads/1/3/4/8/134879753/5bdaead384f43.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367302/normal_5f8874a7e9c2e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372399/normal_5fb851c759d18.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373297/normal_5f8b519572dda.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/26a1fddf-f779-4eb2-8e86-7ca116016817/vibufezij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4749aeef-74b2-4673-8c61-617746fd06c5/depovaketilodot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd2be374-9d84-451d-a66f-5045ea2e0101/67840462335.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd029d13-c22e-4a2e-b7ed-c61386d82da3/ge_microwave_troubleshooting_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c60c565e-d11b-46df-afc6-d8826707f37b/the_ring_of_time_eb_white_summary.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_off0000cf86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF86 5732 bytes
SHA-256: 1958c27bfc563a46d3e197e0a37f8b677e2dd55c42976ce20ccec31a3eb545a1
font_01_sfnt_off0000e2f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F2 10400 bytes
SHA-256: b3921735e6e9d35e3d87b962fd864b410818a1841768a5d3163688588b9d41ff

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