Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3653680616eddee…

MALICIOUS

PDF

67.5 KB Created: 2020-11-11 11:56:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 99b01eca5ed784ed54dc35fda0db0713 SHA-1: 973f4f16663e0458ed2640bde83de50989c09811 SHA-256: d3653680616eddeee33b1c6d2e99b52efa000ce482f7cccdf76c6eb4b89ee727
156 Risk Score

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 0.9977

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?keyword=utc+spring+2020+calendar PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379841/normal_5fa2103b2c764.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366965/normal_5f87b696370ae.pdfIn PDF document text
    • https://weropejo.weebly.com/uploads/1/3/4/3/134321986/4518957.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373008/normal_5f8cacb386bba.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/c2dc1004-fcc7-4c08-9f38-3b0fc8d99014/776_area_code_mexico.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0cc26e7-b8c4-438c-85c0-647f14ed7ff1/44898642291.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e575286f-d575-4efd-aff2-314154dcbd06/best_sims_4_makeup_cc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf8c4285-bd4c-4775-ae9d-bf5346cf1717/gogajavezevurupolekus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4243ca5-b59f-41f4-ab23-5c94343e3e4f/63110758575.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_off0000ca7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA7B 5508 bytes
SHA-256: e8824b011319699e28b1bf87c1163114cc000601ff53041bb8220ff656cb964b
font_01_sfnt_off0000dd42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD42 10712 bytes
SHA-256: e2179e861985fcbe4d4a0354a7e00f7ba0d28fae95e3b87a1e54850df708f82e