Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0ef813e4961e782…

MALICIOUS

PDF

67.5 KB Created: 2021-01-25 18:49:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-01
MD5: 31f20859fadf66abf0ca54b2a985fd08 SHA-1: 6d8c9514b369e042874b1b36bdb89fb44b763234 SHA-256: d0ef813e4961e782575b8374ba462f96dcbde41c519012bde15f839aab8b9865
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://jacksth.ru/123?utm_term=bullies+for+sale+in+california PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4387420/normal_5fec548e9968e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485569/normal_5fdf2d72e445d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415769/normal_5fda4917b1fbf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469837/normal_6008060a24078.pdfIn PDF document text
    • https://wopopodixela.weebly.com/uploads/1/3/0/9/130969383/d95a1888eba4c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503533/normal_5fedab9bc1bf2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381532/normal_5fe5ed47aefb7.pdfIn PDF document text
    • https://bixolajulepu.weebly.com/uploads/1/3/4/7/134746591/4922539.pdfIn PDF document text
    • https://junobinedutuki.weebly.com/uploads/1/3/2/7/132712306/rulexotebabon_torixosilin_madow_wepopu.pdfIn PDF document text
    • https://sulefufevonabu.weebly.com/uploads/1/3/4/3/134363738/6119167.pdfIn PDF document text
    • https://nabivedoki.weebly.com/uploads/1/3/1/4/131407492/wasus.pdfIn PDF document text
    • https://jotinebemoti.weebly.com/uploads/1/3/4/6/134681432/8604717.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xopozajuve.epizy.com/radisuf.pdfIn PDF document text
    • https://s3.amazonaws.com/wupixufekijax/tabamov.pdfIn PDF document text
    • https://s3.amazonaws.com/dorulusof/comparative_degree_worksheet_for_grade_3.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_off0000cb29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB29 4924 bytes
SHA-256: c4f2c7ab579c2f9edbf18c4c8dbf89f1d1e4b041cba417edf57e8201e0e8f2f4
font_01_sfnt_off0000dbf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF7 10976 bytes
SHA-256: 3aec14f0263cefe4bcf7886b56bf7f75adec2daa5a6d6683724538a82091ff1d