Malicious PDF — malware analysis report

Static analysis result for SHA-256 2599768d134275da…

MALICIOUS

PDF

85.4 KB Created: 2020-11-18 15:05:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: bc1c11248c9ce3ae01a9e39e3047d502 SHA-1: 37bf890652ec49c99881f00b6787fe11a9600672 SHA-256: 2599768d134275da6ee913d3dfb43f65069016a06cf0866ed1a328c968caf47b
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, suggesting a link farm or phishing attempt. The presence of embedded URLs and the PDF structure indicate an attempt to redirect users to potentially malicious external sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://trafffi.ru/123?utm_term=fallout+3+perfect+character+guide PDF link annotation
    • https://jezitazosebizag.weebly.com/uploads/1/3/4/7/134700096/xutef_dikak_kobinakafowumi_tivaguxulep.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450502/normal_5fa770214296e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369164/normal_5f9ef3144a1f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368246/normal_5f8b172235eb7.pdfIn PDF document text
    • https://dujodorenenap.weebly.com/uploads/1/3/4/4/134488447/5b1b7b0c9a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383924/normal_5f9160242f33e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369322/normal_5f8da6df106e3.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/wemupajese/kevuretulufixudi.pdfIn PDF document text
    • https://s3.amazonaws.com/xuzed/18759950293.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_off00011328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11328 5360 bytes
SHA-256: a29eee0f14e6e82c0bfc96539bbcb1dd5464bd0d5d54fa5da6c34065b4b0603d
font_01_sfnt_off00012560.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12560 10584 bytes
SHA-256: 329e5cf5db313f8907e42ecff5b6aaf075da3ab0241a6f78f39e2ca51f4e1716