Malicious PDF — malware analysis report

Static analysis result for SHA-256 22feade73dbe7b14…

MALICIOUS

PDF

68.2 KB Created: 2020-11-10 02:58:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: d5dc488fae8013c3ee926bfdb679d1da SHA-1: ee687e5d4b2bcab5c9c0a9b06faca662f05a3edd SHA-256: 22feade73dbe7b14b79f9aac144b8a162523e244b038af01027d424ff548b7aa
214 Risk Score

Malware Insights

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

The PDF contains a link farm designed to redirect users to malicious sites, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' heuristics. The primary malicious URL identified is 'https://traffine.ru/strik?keyword=random+number+and+letter+sequence+generator', which is likely used for phishing or malware distribution. The ML classifier and ClamAV detection further support the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffine.ru/strik?keyword=random+number+and+letter+sequence+generator In PDF document text
    • https://cdn-cms.f-static.net/uploads/4380073/normal_5f8b14daf1d09.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365601/normal_5f9093c376b16.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385417/normal_5f8d3cd10f942.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366407/normal_5f8755ae7a911.pdfIn PDF document text
    • https://sepenunaxob.weebly.com/uploads/1/3/0/7/130776074/cb116a766c60e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377931/normal_5f925266850c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411681/normal_5fa543e941e70.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415334/normal_5f9b16f295a48.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/a45b2000-0329-4d62-a9da-d6ff5ff8bb54/singer_sewing_machine_301_serial_numbers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ada0d20-4c52-47d3-b0a4-6513a6925193/28837633698.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af317778-bc46-48d6-b879-b761262623ca/wefijokosisulaxomal.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_off0000ccb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCB3 5532 bytes
SHA-256: f349ad680b1a880788e234eb8c01d7f6a4629f1fcedcfc9d5c6e92a5b8360f57
font_01_sfnt_off0000df63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF63 10672 bytes
SHA-256: 6076289a4c6364b35a84b5595fd9a1182d16369ff21a8247c2c3c5ea17dee95e

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