Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b3a858784b8d285…

MALICIOUS

PDF

64.3 KB Created: 2021-02-17 16:56:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: acab75152cfe96bd8fd222e4ca86c6f5 SHA-1: 9bc4b35fc0a45adc2e8d07c6b1a8ef8498e97cba SHA-256: 4b3a858784b8d285a0cf866039294e2f9c627a9cf6ba4d2876910e779e2f64f7
194 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • 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/wb?keyword=epson%20xp%20820%20ink In PDF document text
    • https://cdn.sqhk.co/lelogivotosu/f9SBhjN/28149646392.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475217/normal_5ff68a2af012c.pdfIn PDF document text
    • http://greyfruit.space/form_4_biology_bookx4kqu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486356/normal_6020fdf7d9cd7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385634/normal_601495f3a86c7.pdfIn PDF document text
    • http://blognews.top/28263069842i3msj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409604/normal_5ffff00c9019f.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/kikunojulejuj/84597542110.pdfIn PDF document text
    • https://s3.amazonaws.com/bokelur/vulofezozadejim.pdfIn PDF document text
    • https://s3.amazonaws.com/poguvelefa/25866789310.pdfIn PDF document text
    • https://s3.amazonaws.com/liwara/vidmate_karna_hai_kaise_kare.pdfIn PDF document text
    • https://s3.amazonaws.com/dotivaf/75816284002.pdfIn PDF document text
    • https://s3.amazonaws.com/gebukil/lifamenoraxamip.pdfIn PDF document text
    • https://s3.amazonaws.com/rovuweraja/52042769783.pdfIn PDF document text
    • https://s3.amazonaws.com/sakaburepagase/82895501489.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_off0000beb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEB9 5032 bytes
SHA-256: bf0a77d75e94af36fa20eb8462559bed7f03ba935e2072fa455d25327e758107
font_01_sfnt_off0000d002.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD002 10840 bytes
SHA-256: 1b2489f8148ad166ccd19434bd50f213e14d3bba8543edb9a55b97733c70e4b7