Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ce3e4fc3b2efc69…

MALICIOUS

PDF

60.6 KB Created: 2020-11-19 04:46:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: b11459880f3bda83b2246ccbec2ca36b SHA-1: 9033b17eb9fcb1ae50f3f047807786755d58c6ba SHA-256: 5ce3e4fc3b2efc6974c8dcce6a0149dc8b52400712581bb2a1c90fa3a1a91d81
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a 'PDF_SEO_LINK_FARM'. One of the primary external URIs points to 'trafffe.ru', which is likely malicious. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. No scripts were extracted, but the document's structure and embedded links suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafffe.ru/123?utm_term=festus+school+district+superintendent PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366304/normal_5f8a22755dfdf.pdfIn PDF document text
    • https://manapefowuv.weebly.com/uploads/1/3/4/6/134605974/f5ba75cca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455377/normal_5faadff7e1a7b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402953/normal_5faa75edc18da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414494/normal_5fa595c19118c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366018/normal_5f8718fcc247a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491969/normal_5fb40b4e6c2a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374976/normal_5f8dc9ebdea48.pdfIn PDF document text
    • https://likerediweraj.weebly.com/uploads/1/3/4/6/134691167/4532977.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/9c9b5ce1-c2f9-4f43-93c9-99474f199d51/lc_immobilier_bruxelles.pdfIn PDF document text
    • https://s3.amazonaws.com/tobaziw/luwaledibatepul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/457d6103-0463-4562-9c1b-91b6ef3ab06d/30523688514.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d16f3840-a8bb-4fdc-a0b2-fd178e14158b/31776098359.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f35b44b-a832-48b2-8ac1-9a1117fc2ca5/90939990423.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88078c54-2447-4dc4-a123-0462af44ec52/devawewewapudu.pdfIn PDF document text
    • https://s3.amazonaws.com/xuzed/arnold_schoenberg_books.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0c72831-b444-4aa0-aa84-2a62954c5672/fipokezobizizijibekolo.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_off0000b322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB322 4904 bytes
SHA-256: 16fb9d94a9b629e3d24d528f9b6a395a1ffcf4f0643731e774c610bb4a992a81
font_01_sfnt_off0000c3ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3CA 10144 bytes
SHA-256: 9bca7e6f07fbc8f028a584c40fa737ca38c2716704c4f659bef502dadd97fda7

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