Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac23dab51f4326a7…

MALICIOUS

PDF

69.9 KB Created: 2021-02-23 17:21:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 3e0e3330a67958817900790dc20c4450 SHA-1: 0367c7a292caac526bccf19e91a0072933fd7c3d SHA-256: ac23dab51f4326a7fda3ca70321df4afc8707756697b7af8e0ffbb5646234c96
196 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://seumenha.ru/123?utm_term=hp+designjet+4500+driver+download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4394066/normal_5ffd593b23ce7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456685/normal_5fdfbad6d9768.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374976/normal_5ff9639b881dc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462038/normal_6007b94098c4d.pdfIn PDF document text
    • https://cdn.sqhk.co/kopozufu/U8hgZkt/my_new_born_baby_sister.pdfIn PDF document text
    • https://cdn.sqhk.co/ranemagesoga/uhicmjb/peropop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502248/normal_602f5f7922eb4.pdfIn PDF document text
    • https://cdn.sqhk.co/musutalivun/6Fgijf7/alienware_monitor_34_wont_turn_on.pdfIn PDF document text
    • https://lanoxujuzon.weebly.com/uploads/1/3/4/6/134630121/3910a3aa591e2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406482/normal_5fff12cde2b05.pdfIn PDF document text
    • https://cdn.sqhk.co/jivomawufem/eaBFyjf/instagram_gain_followers_apk_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380083/normal_5fd7cef07c27c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450003/normal_602e4b89949fe.pdfIn PDF document text
    • http://pro-komp-master.website/6666830091ej4wv.pdfIn PDF document text
    • https://xonutupusuvulin.weebly.com/uploads/1/3/1/8/131871786/ffb70.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_off0000d479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD479 5668 bytes
SHA-256: d8155d89735c2b0cf2d9e05caf1f93c5c69ee557cc77efd0ec1ab6880e1b8a91
font_01_sfnt_off0000e7fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FB 10204 bytes
SHA-256: 9d8eb94b6d5e1dab0b966ba07ace5eaf4e9dea043aaca09e867cbbd05b6d6743