Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff9135f72dc46c0e…

MALICIOUS

PDF

73.1 KB Created: 2021-01-11 01:23:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: a81c7d7fb0eef3596dd0003e14bb56be SHA-1: 8a6d81bd58a59a742471d25bd1372af8baa93571 SHA-256: ff9135f72dc46c0e879cb49ae7097794fa1b82447b6223bffbb94fed42bd0662
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting it is part of a link farm designed to drive traffic to other sites. The presence of URLs like https://trafftec.ru/123?utm_term=paradise+cove+colorado+weather indicates a potential phishing or content distribution scheme. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://trafftec.ru/123?utm_term=paradise+cove+colorado+weather PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4382412/normal_5f98112a19fd5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387567/normal_5ff5ecc14f476.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385859/normal_5ffa08a59ca73.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455174/normal_5fa6033f8a338.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370063/normal_5f9ed15f481aa.pdfIn PDF document text
    • https://simefaburiso.weebly.com/uploads/1/3/0/8/130814859/divozokame-zugexuzivu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392452/normal_5fe2f104a6ad8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419650/normal_5fd88ffb64357.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407102/normal_5fad7b9d9a7a3.pdfIn PDF document text
    • https://xuredetinumimo.weebly.com/uploads/1/3/4/6/134630251/salujevosuxupejemone.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4CF 4864 bytes
SHA-256: ed3ad048a5e620f01a13d9ccf7ee72772c0b711aa2ea7b745cd3e7645cf2a936
font_01_sfnt_off0000e577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE577 10648 bytes
SHA-256: ca0a7a09b2e6a013ddcdef8cbabc9afa0439d5c48a2efa07ae83baef011fa7fb
font_02_sfnt_off000109f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F1 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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