Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd38f65485d8dd05…

MALICIOUS

PDF

66.3 KB Created: 2021-02-08 15:53:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: e8533b20fe1a4d613ae2d400f069fe7d SHA-1: e75a57d7d531c6b1bcd9bc8a47cf6c3a872734b2 SHA-256: fd38f65485d8dd05bfe27091a87575e934a7cefc93fa0548c3477e6b588d3121
204 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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.
  • 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://bologen.ru/wb?keyword=adm%20apk%20para%20pc PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4377391/normal_6020b75ed2e08.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374520/normal_601b95030d7b7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478932/normal_60010e9d5b6e9.pdfIn PDF document text
    • https://cdn.sqhk.co/fujalapevame/cjgjbF2/toguwililoxevujuzos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390661/normal_600aaa6f5275d.pdfIn PDF document text
    • https://cdn.sqhk.co/basinasedu/jbjhJlW/munerudaluzuxewugoti.pdfIn PDF document text
    • https://cdn.sqhk.co/ramazunor/hfgig2V/mutulikupiridupewis.pdfIn PDF document text
    • https://gusizamavuva.weebly.com/uploads/1/3/4/6/134629738/131e8d0eade.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418993/normal_600ad627e1239.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428054/normal_600f9e862f39e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461791/normal_5fc7b43a3d9d3.pdfIn PDF document text
    • https://rediwugozuza.weebly.com/uploads/1/3/1/4/131438197/vaxumulami.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387229/normal_6008d3c534346.pdfIn PDF document text
    • https://cdn.sqhk.co/risenulowo/cppAUpC/every_color_in_rainbow_order.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452148/normal_5fd9498c23484.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000c7f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7F3 5060 bytes
SHA-256: 5acbb2997563cc5b6ab2efd77f10a004335a10b4124dcb06f254afe2e9f54207
font_01_sfnt_off0000d915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD915 10412 bytes
SHA-256: 92adeaefa316ada3c853d2433ffb6615495849022cf3270ae3cbbf15a21b75e8