Malicious PDF — malware analysis report

Static analysis result for SHA-256 db40dc76b2a2554d…

MALICIOUS

PDF

77.3 KB Created: 2021-01-07 20:49:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 05b10f0cf904837c6318da49098984fd SHA-1: 6fb63e59316f8dc5af74f066e1a722f80977bb37 SHA-256: db40dc76b2a2554d1d1aa93e46a6005d1c1419362b7d51748f8d0ca4704276e8
164 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many pointing to PDF files hosted on various platforms, suggesting a link farm or redirection scheme. The presence of a 'download button' lure and a high ML classifier score, combined with ClamAV detection as 'Pdf.Phishing.Trojan', indicates a malicious intent to redirect users to potentially harmful content. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDF documents from web content, further supporting the redirection hypothesis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://traffking.ru/aws?utm_term=audio+bible+british+accent PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4375705/normal_5fe0702d6ff66.pdfIn PDF document text
    • https://fozegujulukov.weebly.com/uploads/1/3/4/4/134459046/4f93060125.pdfIn PDF document text
    • https://bixagitiwor.weebly.com/uploads/1/3/4/6/134618264/8722bc01a7434ae.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369164/normal_5fc57bda039d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460243/normal_5fbe05a70a810.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372080/normal_5fe9733a6e9f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385415/normal_5fa0ab35c5a8e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376354/normal_5fb25b2fe6bde.pdfIn PDF document text
    • https://bumovewadenol.weebly.com/uploads/1/3/5/3/135318567/9099697.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/c1095776-8e84-4fae-a1a3-ae8b11dce08d/lomulamelorerexedit.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e54f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE54F 5036 bytes
SHA-256: 033e34de1ec51452b0dafa921b5590e7f8742e89f74f1f89253da341f7367993
font_01_sfnt_off0000f656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF656 10592 bytes
SHA-256: 4f1cf3b23f5a519bfc051535033a95593ae54bbad5fce468c4ce2ea8a46736f9
font_02_sfnt_off00011a99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A99 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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