Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5e76ed31261420d…

MALICIOUS

PDF

82.8 KB Created: 2020-11-14 15:25:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: ecc651e317277a2d295d07830ea140f2 SHA-1: 18a73601f183c329b132e9cbcc826e13be1a2ee2 SHA-256: f5e76ed31261420d48c7334d015bc415f3ab0e4df390437a38781dd9f78940bd
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting a coordinated effort to direct users to various external resources. One prominent URL, 'https://traffset.ru/123?utm_term=housekeeper+and+the+professor+pdf', is directly associated with the document's content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/123?utm_term=housekeeper+and+the+professor+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4370989/normal_5f896cb66aba9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388285/normal_5f8dfcfc60608.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416144/normal_5f9d10d442bbc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387933/normal_5f9ca46bacb8a.pdfIn PDF document text
    • https://samegitu.weebly.com/uploads/1/3/4/3/134333662/leterelidu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382406/normal_5f904a5431e2e.pdfIn PDF document text
    • https://gupenuwod.weebly.com/uploads/1/3/4/5/134518336/lebig.pdfIn PDF document text
    • https://riwisasivituw.weebly.com/uploads/1/3/1/0/131070703/gosowitiza.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/78f9fb46-11df-4e90-a3ae-45ce8c20feb4/epistemology_of_the_closet_sparknote.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11e870ed-c1dd-4ce5-90a9-e8f2d0867e27/sandstorm_photoshop_action_kickass.pdfIn PDF document text
    • https://s3.amazonaws.com/livivuvuwugeb/biwemituxasoditofojevim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1cc2fd46-43db-4636-8f60-ed28cab4c67c/fish_tacos_with_cabbage_slaw_avocado.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38304362-3fc4-4f1f-a632-2ed35920ceef/numbers_after_trillion_aa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/692adc3d-4ae2-4a2a-b97d-8f69f0187a3e/vexixixosese.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_off0001078a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078A 5124 bytes
SHA-256: 84ac6f1c00fb313fe9372b32699ff50eb368071277bd23cf8bed0ea728d38b2a
font_01_sfnt_off000118ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118EF 11036 bytes
SHA-256: 7affbf1b4d900accb71bcd09f05823908316bcf6d4cc842951951f2b67318dd7

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