Malicious PDF — malware analysis report

Static analysis result for SHA-256 81fc29b7609c65fd…

MALICIOUS

PDF

71.1 KB Created: 2021-02-15 16:33:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 3d84a0830457bbe2701f718832206173 SHA-1: 3508394fe068c9f3689707575e47be14d257b46b SHA-256: 81fc29b7609c65fdb3b8f256c137f6e3812aeb26b10957a1fe4c7d61caa1e0e7
196 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/wb?keyword=usb%20wire%20colors%20white PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4369922/normal_5ffc134a1a6a4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417413/normal_5fe0e0ff5480c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414489/normal_6015aea516783.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403805/normal_601157549cee9.pdfIn PDF document text
    • https://zizusufake.weebly.com/uploads/1/3/4/6/134646877/820933b60.pdfIn PDF document text
    • https://sijalafad.weebly.com/uploads/1/3/4/8/134887162/3130144.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380692/normal_5ff7a4c0aa4cb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481272/normal_5ff765cc8183a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383582/normal_5fd08d3692918.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414166/normal_600c6931d5460.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411919/normal_5fdc04cb421a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392656/normal_60234daa17455.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461485/normal_5fd841f5aa4a0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451225/normal_5febf4a48db0b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386092/normal_5fceaf4832419.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_off0000db13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB13 4900 bytes
SHA-256: 333e069ea5461b5249a558e0b10e28cba17718ce196b18be159ffee803154f61
font_01_sfnt_off0000ebd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD3 10532 bytes
SHA-256: 6229c2b8dbaa69b1a763b440609599b169d9d6715c7c4bcf5180fc602070e696

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