Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca4abfa7e3d009b4…

MALICIOUS

PDF

68.7 KB Created: 2020-11-27 17:47:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 3a0bff9e1f7de164824b3753f2ee8cc0 SHA-1: 95f67b4373e67d060fe5712147beb1b1afcbb58d SHA-256: ca4abfa7e3d009b43abf5fa81f9dc047df21d60b790ca9580d4f39690660864a
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. 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 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://traffine.ru/123?utm_term=the+immortals+series+book+order PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4450139/normal_5fa3e765a37fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421627/normal_5f9f2d5b4edac.pdfIn PDF document text
    • https://wesojejupeledaw.weebly.com/uploads/1/3/4/4/134446418/9118578.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368481/normal_5f94d3bc6ac85.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420906/normal_5fb2687e56c83.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388060/normal_5fa81a28e6668.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448735/normal_5faa365f437c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367922/normal_5fb35a34a76e9.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/2e258006-907e-4e2f-a094-b6529b8058c7/fender_sidekick_reverb_25_schematic.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/266664f2-e70c-4fc6-ab5e-57b989682c1e/dasuwizapubipabaxozovegu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf93f056-805c-49a7-bd2e-257be23f7d2b/nopuru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9dc16d2-9a2e-4941-8c42-41a6feb5cc57/74024441342.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_off0000cd0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD0B 5216 bytes
SHA-256: 22e04d26af7c6dfc17d1df295b81dfe8923484f78cce2ffe5ca5a9cb1ea38830
font_01_sfnt_off0000de93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE93 11116 bytes
SHA-256: 74b6c07ca4158a277d628353ec20dbdc429d783814780d975594411a60725c6c

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