Malicious PDF — malware analysis report

Static analysis result for SHA-256 421b9de1976ad79a…

MALICIOUS

PDF

71.8 KB Created: 2021-02-26 08:51:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-01
MD5: f90cf7b73a42de6506eaaea09d4c2f27 SHA-1: 8733d3ea946bc5c24ce2b74ee5a91e110701ae23 SHA-256: 421b9de1976ad79a8aba8d76cfaa5470ebc8f52a40a3bfc640b307695420e335
136 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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://jottigo.ru/award?keyword=how+are+the+house+and+senate+different PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4453889/normal_6032d0b15b2f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460042/normal_602508240b97e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446382/normal_5fda78a885afd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471096/normal_60313c4f466a4.pdfIn PDF document text
    • http://powajaxib.medianewsonline.com/rojefudus.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419410/normal_6002b68920424.pdfIn PDF document text
    • https://cdn.sqhk.co/nasanoroge/ijahhi3/xipebonilug.pdfIn PDF document text
    • https://cdn.sqhk.co/jesupasuzoku/vXjfQlR/4595717706.pdfIn PDF document text
    • https://cdn.sqhk.co/wudawagirus/gjhahhW/sad_anime_boy_wallpaper_4k.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417990/normal_600beee3664a7.pdfIn PDF document text
    • https://cdn.sqhk.co/zupuguvawaj/jajixgd/92523898186.pdfIn PDF document text
    • https://cdn.sqhk.co/tomubozes/idrichf/rivals_at_war_2084_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/wogefosa/gjihiTK/fafixeniwoluwe.pdfIn PDF document text
    • https://cdn.sqhk.co/vupapevixu/L8JZgeI/36735263897.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_off0000de0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE0F 5016 bytes
SHA-256: 9ec28990cb894ab985787de5d11e16d6f658d805235c1f5dc9ce2eb98927d1ea
font_01_sfnt_off0000ef26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF26 10328 bytes
SHA-256: 7d28ab1995a3753ba31ab1974485f3f44f2d1b0f211b9758d6f34933d96dc7c5