Malicious PDF — malware analysis report

Static analysis result for SHA-256 64e2bf93781703f7…

MALICIOUS

PDF

91.2 KB Created: 2021-06-08 11:17:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: fd984037a274a5548c3a3f8b1c5327e5 SHA-1: c8ecb4cd04b4397c57554886c1e8f065b9b35d85 SHA-256: 64e2bf93781703f7a29fbfac7775de1faec4ea508d3f93c77ea0b6fd72bae301
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm for SEO manipulation or malware distribution. The ClamAV detection and ML classifier indicate malicious intent, likely related to phishing or trojan delivery. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7847

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://nomylo.ru/pbw?utm_term=the+ab+guide+to+music+theory+chapter+1%252F2 PDF link annotation
    • https://lumirofelefepo.weebly.com/uploads/1/3/4/8/134892557/2270845.pdfIn PDF document text
    • https://bipixexomalexu.weebly.com/uploads/1/3/4/3/134349320/vilemenut.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418747/normal_600c6faca966d.pdfIn PDF document text
    • https://reserekeluzor.weebly.com/uploads/1/3/4/7/134721257/9a7f3c.pdfIn PDF document text
    • https://lokejefu.weebly.com/uploads/1/3/5/3/135301848/8074119.pdfIn PDF document text
    • https://xizovetezewo.weebly.com/uploads/1/3/2/8/132814166/c8fe5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450512/normal_60beb2f5d9f7a.pdfIn PDF document text
    • https://pugoterofox.weebly.com/uploads/1/3/4/6/134608128/rajaretuxa.pdfIn PDF document text
    • https://xorukulimuz.weebly.com/uploads/1/3/4/7/134728044/zuwojitej_gukokovarisol_sarababu.pdfIn PDF document text
    • https://rirenumu.weebly.com/uploads/1/3/4/8/134884077/49f97d8.pdfIn PDF document text
    • https://korisupugi.weebly.com/uploads/1/3/5/3/135308649/fisezaweveva_nizogune_gevonumugibus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465010/normal_5fe7f935cbf9f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493610/normal_6015873988589.pdfIn PDF document text
    • https://nopogevoxipati.weebly.com/uploads/1/3/1/4/131410158/3645303.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476152/normal_600ae3e292f1e.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/0903255e-8b4c-4c41-8f0e-ce85e526b872/48976420046.pdfIn PDF document text
    • http://vedufid.pbworks.com/f/wireginurasuzizituzule.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7b130a0-9765-471e-bb94-245717dea497/jigalokaduneki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae210794-5b96-4ca4-b36c-643d388d4e80/pugifimumugov.pdfIn PDF document text
    • http://wizepexu.pbworks.com/f/investigating_biology_lab_manual_8th_edition_download.pdfIn PDF document text
    • http://zusemivak.pbworks.com/f/circulatory_system_ks3_worksheet.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14690 5868 bytes
SHA-256: 43f6bc5c2cd7f01cfa4b78b378924971e31bd365b5de50b434f883a4bdcb8883

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