Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3e082ea21e45242…

MALICIOUS

PDF

72.3 KB Created: 2021-01-25 21:00:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 3e1c8bea01784fd72c3e9bb2e2d87c67 SHA-1: 99b0315be5a1fb93e76d5b6595c51bdca591bb7e SHA-256: b3e082ea21e45242e7f7d83fbf6f1c1cd63fed76aa093664cf512258e6f5d508
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially malicious content. The document body, though heavily obfuscated, appears to be related to sheet music, serving as a lure to encourage clicks on these external links.

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.
  • 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
  • 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://seumenha.ru/aws?utm_term=malaguena+easy+piano+free+sheet+music PDF link annotation
    • https://jitolubupiloz.weebly.com/uploads/1/3/4/6/134637312/xomenizofaditam_genutonon.pdfIn PDF document text
    • https://voxonevixes.weebly.com/uploads/1/3/4/3/134383310/savutatiwagupu.pdfIn PDF document text
    • https://labejewatek.weebly.com/uploads/1/3/5/3/135399287/c90df35d.pdfIn PDF document text
    • https://jofusowosa.weebly.com/uploads/1/3/4/7/134764533/jomedejivilejesi.pdfIn PDF document text
    • https://fosaxobe.weebly.com/uploads/1/3/4/8/134882536/guvip.pdfIn PDF document text
    • http://nazhivy.net/zawamojajolasokevolono6qmje.pdfIn PDF document text
    • http://belkwigs.com/73112057661fck3q.pdfIn PDF document text
    • https://nibuwoxemunovox.weebly.com/uploads/1/3/4/7/134714338/3070682.pdfIn PDF document text
    • https://xalakadumikimam.weebly.com/uploads/1/3/1/4/131437423/fobusoxegedorutip.pdfIn PDF document text
    • https://texifafotolatip.weebly.com/uploads/1/3/4/7/134764930/4891518.pdfIn PDF document text
    • https://kaneloko.weebly.com/uploads/1/3/1/4/131408798/d57a5.pdfIn PDF document text
    • https://sivipamekan.weebly.com/uploads/1/3/2/6/132682587/63fc2a3ff6c5.pdfIn PDF document text
    • https://gedodigu.weebly.com/uploads/1/3/5/3/135312539/rosoxabazi.pdfIn PDF document text
    • https://vozozexofevufut.weebly.com/uploads/1/3/1/8/131871902/3055145.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/tugumeb/5124707356.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_off0000ddd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD6 5536 bytes
SHA-256: bb7b2963f3a0236f63884c6e040f66c79d6b0e753ee2ef7fa8b45dc1a525a683
font_01_sfnt_off0000f099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF099 10412 bytes
SHA-256: a0c3af3eccfa8bd4e317f00fc0c21fc1388dac2d53645e357e6963961bb85f98

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