Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4db7621a06ec6cd…

MALICIOUS

PDF

66.8 KB Created: 2020-11-11 13:05:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: bf6493437a410d6dd978e0076d958f76 SHA-1: d1b72f3718927811f414c4f9aba8206efae93a52 SHA-256: a4db7621a06ec6cd23011147704c2a50733c9c4094a56fd611f4345d2351b40e
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF files, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier output strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of a malicious document designed to redirect users to potentially harmful content.

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://trafftec.ru/strik?keyword=himalayan+guide+crossword+clue PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4424982/normal_5f987ae8a1b4f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402533/normal_5f94f39431bd5.pdfIn PDF document text
    • https://vulewerogoxo.weebly.com/uploads/1/3/4/5/134507491/lulinajejataferonixu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387932/normal_5f8cfe68b2777.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372735/normal_5f893a7fc5637.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448337/normal_5faad920114f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414502/normal_5f9c105913cd0.pdfIn PDF document text
    • https://sikupawabur.weebly.com/uploads/1/3/4/6/134624396/6afe77859f7fdd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370299/normal_5f9d01a994bde.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411500/normal_5fa076efdb945.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/7dc9c57d-5adc-4dce-ac25-d153b812aa1a/nopekixizotinewalarinovo.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/59332988721.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_off0000c87c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC87C 5416 bytes
SHA-256: 18a1816e596d52e862d6fe910b27dfd68ae3b58b54f1988773fe2260b1b83a93
font_01_sfnt_off0000dae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE0 10596 bytes
SHA-256: c92bb00abf577c555fd0bb14cefd2e821a579ca47f7bbfc8f9b15c8b8b836946

Open this report in the interactive analyzer, or submit your own file for analysis.