Malicious PDF — malware analysis report

Static analysis result for SHA-256 b773de085418648a…

MALICIOUS

PDF

70.9 KB Created: 2021-02-14 09:46:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-19
MD5: 7ee1aa9d46fe34d92c0f82f6e9eae4ec SHA-1: 8cde95a3c9b743bd13c90061f1a6d3cf6aa91285 SHA-256: b773de085418648a25fd48d458f4230541c1b7ca4f31b27513adf28c59312184
254 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://crophysi.ru/wix?keyword=tennessee+cdl+hazmat+study+guide+pdf In PDF document text
    • http://reduslimitalia-ufficiale.site/behind_the_neck_press_formtf043.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407552/normal_5fcf2fecceacd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481161/normal_601e0051863b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463272/normal_602123f973a33.pdfIn PDF document text
    • https://fivixevovisobav.weebly.com/uploads/1/3/1/3/131380347/rutiverinatawa.pdfIn PDF document text
    • https://zesakexe.weebly.com/uploads/1/3/5/3/135314388/7305311.pdfIn PDF document text
    • http://women-ita.space/62559130412eghgu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474997/normal_60013cd8f0ba6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481684/normal_5ffdfbf41d4fb.pdfIn PDF document text
    • https://pibefugaradaxo.weebly.com/uploads/1/3/1/3/131398186/9786437.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425933/normal_60137c9707067.pdfIn PDF document text
    • https://zotekuruwufuk.weebly.com/uploads/1/3/4/1/134108654/2492763.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491414/normal_5fcb3fcea0595.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369519/normal_5ffc642243db9.pdfIn PDF document text
    • http://rent-nout.site/54724828661yc8l.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/biwubeleba/pikijizokipubez.pdfIn PDF document text
    • https://s3.amazonaws.com/padanivozeb/writing_coherent_paragraphs_worksheet.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_off0000d6c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C9 5576 bytes
SHA-256: bf0725fb8d939a3e11f4dca8aeed27237421fa54497ade336847cbf5958bdea3
font_01_sfnt_off0000e9b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B1 10872 bytes
SHA-256: c8bf1fb07c303d4d75634bb39bf36a3584b9f56f0c655fbfb1af677f7c699bab