Malicious PDF — malware analysis report

Static analysis result for SHA-256 26b52e9f4dca8740…

MALICIOUS

PDF

70.2 KB Created: 2021-01-06 11:36:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 3a9affa919bdd52fe1e43077e7d99f10 SHA-1: 735e529354879654c87127961feec254a183e8d4 SHA-256: 26b52e9f4dca8740188329df6bea6650c8b971d974fcd4f672f49dc5c7047f40
214 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, with one specifically identified as a malicious redirector. The heuristic firings indicate a deliberate attempt to create a link farm, likely for SEO manipulation or to distribute malicious content. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' further supports the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://traffine.ru/aws?utm_term=haunted+mansion+holiday+sheet+music In PDF document text
    • https://pituxujufu.weebly.com/uploads/1/3/1/8/131856071/karow.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469630/normal_5fba67c7dc508.pdfIn PDF document text
    • https://cdn.sqhk.co/vozofugova/hd3hbhc/free_tv_shows_and_movies_app.pdfIn PDF document text
    • https://cdn.sqhk.co/numokafas/gc6GY8a/lock_screen_naruto_wallpaper_iphone_7.pdfIn PDF document text
    • https://nivujetomut.weebly.com/uploads/1/3/4/7/134753784/545925.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/dinisemowoge/strategic_business_plan_template_ppt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98588419-f295-48ee-9d15-797e8a557c91/blood_rose_png.pdfIn PDF document text
    • https://s3.amazonaws.com/neporezofov/bharathiyar_kavithaigal_book_free.pdfIn PDF document text
    • https://s3.amazonaws.com/datarofapakil/tewexagawoxoroketexokekip.pdfIn PDF document text
    • https://s3.amazonaws.com/piradi/76649978221.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_off0000d739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD739 5148 bytes
SHA-256: 01c6cb0fb1381ba3dc9d2462cf3acfe775628558b84f67f7088a84d3d192c70a
font_01_sfnt_off0000e89b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE89B 10468 bytes
SHA-256: 82339e1faba2c6cf4d584cc9132a99c5a10692bcfa3b65b8f2a68fc628650b13

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