Malicious PDF — malware analysis report

Static analysis result for SHA-256 90bf5850b671ae53…

MALICIOUS

PDF

67.1 KB Created: 2021-02-20 20:13:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 33d07fe40728c6c4d90fb0a09f9af0b2 SHA-1: 0e723ef066da04e3633015334b02709ef468aa56 SHA-256: 90bf5850b671ae53d52cc2c4d9af6bdb29d9ebf111e1da52a0515c5a8328af86
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as 'Pdf.Phishing.Trojan'. It contains numerous embedded URLs pointing to disposable domains, suggesting a phishing or malware distribution campaign. The document body, though heavily obfuscated, appears to be a lure related to broadband issues, aiming to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://maypoin.ru/strik?utm_term=what+does+it+mean+when+broadband+is+flashing+red PDF link annotation
    • https://ditixalopu.weebly.com/uploads/1/3/1/4/131410538/2b3414d25724.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411694/normal_5ff0a334ecf23.pdfIn PDF document text
    • http://xxlmature.site/flight_stability_and_automatic_control_2nd_editionvz8s9.pdfIn PDF document text
    • http://mbfsopg.com/ley_de_biotzrqhl.pdfIn PDF document text
    • http://womans30planet.com/13008332362oji3o.pdfIn PDF document text
    • https://fuwupizur.weebly.com/uploads/1/3/5/3/135390256/8972447.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492575/normal_60314d2bbd431.pdfIn PDF document text
    • http://aires.fun/international_business_management_degree_in_sri_lankavt9dx.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414152/normal_5fc5e874a4093.pdfIn PDF document text
    • http://phtech.site/popular_wars_unblockedvhour.pdfIn PDF document text
    • http://idealslimitaly.site/pawolakinemiropowe9l5uz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000c902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC902 5564 bytes
SHA-256: 4d88d3fbbb3ed19275231a5f2c48a4d65f9ba22c81eae6c5f1d1e2770d64101d
font_01_sfnt_off0000dbdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBDB 10416 bytes
SHA-256: 370ac079c468a93cf8236c254e1b65196bf020aa0439e46356a1221b2fcdb299

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