Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3086d32d398c973…

MALICIOUS

PDF

90.7 KB Created: 2020-12-24 16:54:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 905861e214eb4626d83b39981c3f79df SHA-1: 7aeb4832ea504ddf1a3e73bfcb563fa3638cd8cb SHA-256: d3086d32d398c973df8e9e8785d57c4e2f6ba2f174762f78cd59ea92a6d5cb0b
202 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file exhibits characteristics of a phishing or malware distribution lure, indicated by the 'Fake invoice / payment lure' and 'Visual download / call-to-action button lure' heuristics. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely involving the distribution of a second-stage payload via the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 8

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://traffking.ru/strik?utm_term=starlink+battle+for+atlas+ps4 PDF link annotation
    • https://majubatu.weebly.com/uploads/1/3/4/2/134265851/xirujurokewi.pdfIn PDF document text
    • https://cdn.sqhk.co/wiluxuko/jeXwRv4/bubble_witch_2_saga_play_online.pdfIn PDF document text
    • https://pefikasulanak.weebly.com/uploads/1/3/4/3/134350375/vofol.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448538/normal_5fc4788a557c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420239/normal_5f9eae240238c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385415/normal_5fa6742678a98.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416786/normal_5fe463a4025d2.pdfIn PDF document text
    • https://joleziravakejar.weebly.com/uploads/1/3/4/4/134460301/9755109.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457861/normal_5fe0b6fd18065.pdfIn PDF document text
    • https://wumibopoz.weebly.com/uploads/1/3/4/5/134511789/weselusak.pdfIn PDF document text
    • https://tivumujodul.weebly.com/uploads/1/3/4/6/134608740/1c47ecfd75.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/221a5248-4e6d-4c90-b91e-801d63125f26/double_your_contacts.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_off0001229d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1229D 5288 bytes
SHA-256: 4b009a58f603fa2e0edbd75f3a3e7784a4302ad6bbeebfda285f8ea574ced12b
font_01_sfnt_off000134a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134A9 13360 bytes
SHA-256: 5993ac84b5b7de0f6eacc86dcb11113b2d14325144d5e4c8b49e516bfa38711c

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