Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0af781761e3e974…

MALICIOUS

PDF

74.4 KB Created: 2021-01-24 17:54:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 9431c21e3c835ccc69a8faafab96ece9 SHA-1: e700c99c21a8a3cd63d80ee282290918dcb98d78 SHA-256: b0af781761e3e97456c4206612b91e3b3b9389946ad27f09e6912756104174e8
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, many pointing to disposable hosting services, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution vector, likely initiated via spearphishing attachment.

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 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://trafficel.ru/123?utm_term=buena+vista+lake+address PDF link annotation
    • https://cdn.sqhk.co/japexexuko/Rsjanid/tucson_gem_mineral_show_2020.pdfIn PDF document text
    • https://noruwapawufibem.weebly.com/uploads/1/3/0/9/130969999/subuwemone.pdfIn PDF document text
    • https://bivovupoxewoko.weebly.com/uploads/1/3/1/3/131380626/zoduzozalugenoxinag.pdfIn PDF document text
    • https://nopogevoxipati.weebly.com/uploads/1/3/1/4/131410158/661812.pdfIn PDF document text
    • http://ttttrrrr.space/thunder_stock_cars_26gmyz.pdfIn PDF document text
    • http://daburus.iblogger.org/netflix_movies_on_my_macbook.pdfIn PDF document text
    • https://cdn.sqhk.co/fenajobuwer/ibpieji/fake_call_app_download_jio_phone.pdfIn PDF document text
    • https://cdn.sqhk.co/nivipanevi/5sojcj7/skydiving_costa_rica_prices.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/tesasubawalozan/68311207543.pdfIn PDF document text
    • http://lizolubemerawi.epizy.com/jixumobofawarikexipe.pdfIn PDF document text
    • https://s3.amazonaws.com/kudufigunabi/5618363159.pdfIn PDF document text
    • https://s3.amazonaws.com/fofeguj/xamizumi.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_off0000e69c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE69C 4992 bytes
SHA-256: c5dadb5e6975edf50fa88878e886146d6ff5fdc6658d7d63f3b9a4e89416afe5
font_01_sfnt_off0000f7a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A8 11036 bytes
SHA-256: 57ebfeae2cf736bd5de7d63e12f83080af0723ccd5e30322ddfaec284629cee8

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