Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf8bc99577cc4d6c…

MALICIOUS

PDF

76.6 KB Created: 2020-11-14 11:23:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: 1def5ab13e4feddfb0949700fc44aefb SHA-1: 82dd699158c3b9df7c7c32c34dbeddc1fa8b7c79 SHA-256: bf8bc99577cc4d6ceda257413276fc912505a9dde2437d17f46ecdff49953e95
254 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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.
  • 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://gettraff.ru/aws?utm_term=gcse+circuit+symbols+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4389585/normal_5f9914339ad05.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369499/normal_5f9ed7880bc84.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366331/normal_5f9002667c49d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461523/normal_5fa74f35934fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382972/normal_5fa2a229628d4.pdfIn PDF document text
    • https://ziwugedaxuz.weebly.com/uploads/1/3/4/5/134501511/d42537.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383916/normal_5f8dc948749f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480736/normal_5faba552153fa.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/duzexefemosaxe/database_management_system_for_competitive_exams.pdfIn PDF document text
    • https://s3.amazonaws.com/laradusa/29824482522.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_off0000ed60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED60 5364 bytes
SHA-256: 9bb0ea60278a2dd401a1e65c7b49efb993e4633b48b5d7e570a738f59f4a7b87
font_01_sfnt_off0000ff91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF91 11248 bytes
SHA-256: 587a890fe40d02ee6783673bc1591f22fc2e2b469af11d62d764d7eaddbde711