Malicious PDF — malware analysis report

Static analysis result for SHA-256 25fbe3506c9a111d…

MALICIOUS

PDF

128.1 KB Created: 2021-05-26 15:41:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 22e7e96d5e9182d4b716abf0c8988722 SHA-1: 21cd5413aca2ffc899b882fe48376cac759c8bbd SHA-256: 25fbe3506c9a111dcb7e28d8ea8d0e7dc62768347013dc50fbb69bc12bd1690a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, a common tactic for phishing or malware distribution. The heuristic PDF_SEO_LINK_FARM indicates a large number of links, and ClamAV detected it as Pdf.Phishing.Trojan. The embedded URL points to a domain that is likely part of a phishing campaign, attempting to lure users with a fake exam document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://bologen.ru/strik?utm_term=examen+matem%25C3%25A1ticas+6+primaria+porcentajes+y+proporcionalidad PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4471249/normal_602be7df69d04.pdfIn PDF document text
    • https://foworagajiwodim.weebly.com/uploads/1/3/0/9/130969946/tiketajokar.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413361/normal_5fef8df6c9a17.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417528/normal_600355fd970c2.pdfIn PDF document text
    • https://rolarijigajegij.weebly.com/uploads/1/3/1/4/131438579/5dca921.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456122/normal_5ff6d196a096b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445326/normal_6047c3d0745db.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420039/normal_6003a34cab500.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450439/normal_604fef2c61b85.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492259/normal_5fe76ce0cabef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485568/normal_604356303f251.pdfIn PDF document text
    • https://midubumiw.weebly.com/uploads/1/3/5/9/135989619/batubekuwo_sakom_jurebemixanovi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413227/normal_6049290609c80.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386087/normal_6035aad862b31.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500208/normal_602abd3651b1d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447251/normal_600c1f2247a66.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374203/normal_602944636d97b.pdfIn PDF document text
    • https://geliwesirodired.weebly.com/uploads/1/3/1/3/131382982/906230.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5b876bb-e69c-41d3-83fc-e34c7063c95d/potowitifojasotesujoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7256476-9125-4d0f-979c-7b78a7c58489/hamari_adhuri_kahani_full_movie_download_hd_720p_bluray.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/591d307d-28ab-4483-9627-7540cdf6a4df/the_hierophant_love_present.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a1ccd5d-cd6d-4e0c-9614-7c4cb8824d61/sudawirakedabisexu.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_off0001b14a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B14A 5808 bytes
SHA-256: 0498ce74e0540d6c8d73af5f5506f256c85d99f1ae50bf40d040022b224649ae
font_01_sfnt_off0001c47d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C47D 13496 bytes
SHA-256: 29ac8dbb228974c43c6dbee653d590f1cc302f1c29b8e07c7253f204b513c48c

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