Malicious PDF — malware analysis report

Static analysis result for SHA-256 af0455911b731782…

MALICIOUS

PDF

68.9 KB Created: 2020-11-16 15:14:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: b62b2926a694e758ab10b73f951c89c8 SHA-1: d5fe118d0963caa14ea76c90b6136251c12264d5 SHA-256: af0455911b7317821ad912c184f7b84598a84baf8ba10842012b9f27a18cb998
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 0.9998

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://traffset.ru/123?utm_term=quick+pdf+scanner+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4373502/normal_5f97fc69cc318.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455907/normal_5fad8c24e3231.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367944/normal_5f8ab4fe8a9ba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370299/normal_5fa31522c8a7d.pdfIn PDF document text
    • https://genigudepa.weebly.com/uploads/1/3/1/0/131070712/ff06dfdf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370299/normal_5f89c710af571.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385631/normal_5f8c9eec5a1dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443619/normal_5fa907b134054.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384323/normal_5f9741478c443.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fulosobezur/xawurej.pdfIn PDF document text
    • https://s3.amazonaws.com/tesapibebujep/reading_diary_template_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae244f64-6904-4543-a31b-abd142e3973c/zozilidepiluxavumezoguved.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52cb078d-1d43-43fc-bc35-57fae4c5e1fa/57071605271.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_off0000d231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD231 5244 bytes
SHA-256: fe0bc64fe002889403d19c9760079fccf93c8e1c3266e241eee913dd42161928
font_01_sfnt_off0000e41e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE41E 10204 bytes
SHA-256: 5b91df615352175cb53bdcdc0a4dd1c0164e24226137a2d8437cdfacb5667cf5