Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9b4d05c56474255…

MALICIOUS

PDF

96.4 KB Created: 2020-12-18 06:42:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 66613058a7aa5b5ed0eccae8a700b2ed SHA-1: 1620b909986ed51f7b890de2faf2d5ca87932830 SHA-256: b9b4d05c56474255fd353210e3be4d61be877d61e0420089864822cf5cb45c87
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of embedded links, many pointing to redirectors or link farms, suggesting a phishing or SEO manipulation campaign. The primary malicious link identified is https://gettraff.ru/strik?utm_term=30-15+intermittent+fitness+test+validity, which likely leads to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://gettraff.ru/strik?utm_term=30-15+intermittent+fitness+test+validity In PDF document text
    • https://static.s123-cdn-static.com/uploads/4370051/normal_5fc62df02f1f4.pdfIn PDF document text
    • https://jedawakebikota.weebly.com/uploads/1/3/4/7/134715316/8926088.pdfIn PDF document text
    • https://vedixoba.weebly.com/uploads/1/3/4/8/134864822/zirotimukawavog-melowalolim-rutevasi.pdfIn PDF document text
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/837046.pdfIn PDF document text
    • https://nobenegutebofem.weebly.com/uploads/1/3/4/6/134615432/c03d3.pdfIn PDF document text
    • https://wivixape.weebly.com/uploads/1/3/4/8/134897282/kidinege.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384310/normal_5fa103ada4358.pdfIn PDF document text
    • https://xudiruxi.weebly.com/uploads/1/3/4/6/134630049/vekib.pdfIn PDF document text
    • https://rilemiwekeb.weebly.com/uploads/1/3/4/5/134599700/fb658123f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471509/normal_5fa5c0c19d128.pdfIn PDF document text
    • https://pobunusegem.weebly.com/uploads/1/3/4/4/134460984/wenokaleb_ziwebukoxinufuv_zaxasanip.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/sewamos/22324603028.pdfIn PDF document text
    • https://s3.amazonaws.com/batoragubukepo/raraduxokuwavoz.pdfIn PDF document text
    • https://s3.amazonaws.com/gofilafixu/brilliant_smart_app.pdfIn PDF document text
    • https://s3.amazonaws.com/xamibebulosaxug/questions_and_answers_for_possessive_pronouns.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_off000133cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133CF 5632 bytes
SHA-256: 7194dc18131ecd8d57f680ec652f0a607fcc8d83459b61bf8778511a77955ba5
font_01_sfnt_off00014706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14706 13524 bytes
SHA-256: 36caef928d12e1e73171fc8acde8b2ea242d3d2fed46f6571e13ac7477b4d6ed

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