Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6be9dffe46f2995…

MALICIOUS

PDF

73.3 KB Created: 2021-02-21 00:46:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: a12379762ad46315be5c3aa696b9a59b SHA-1: 83a54fe97fe3104aef23041b96b28fbaf25266a2 SHA-256: e6be9dffe46f29959a14146c7a1c27260a73393984a745748c775a0428d322c0
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting domains and are likely part of a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. While no scripts were directly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/strik?utm_term=best+gaming+router+for+verizon+fios PDF link annotation
    • http://pizabalex.22web.org/fekime.pdfIn PDF document text
    • http://susarivusu.22web.org/las_batallas_en_el_desierto_descripcion_de_personajes.pdfIn PDF document text
    • https://cdn.sqhk.co/bitulore/Hvjjeib/pinball_golf_rules.pdfIn PDF document text
    • https://cdn.sqhk.co/gujipiror/jHigcyM/11790210899.pdfIn PDF document text
    • http://vibuluvizawo.66ghz.com/acr_mammogram_guidelines.pdfIn PDF document text
    • https://cdn.sqhk.co/daluzowinasu/gjgcsif/wujakoxofer.pdfIn PDF document text
    • https://cdn.sqhk.co/gukisafuw/iadhaji/57122493045.pdfIn PDF document text
    • http://tafuvomilo.22web.org/what_are_some_examples_of_the_8_parts_of_speech.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://funizenobuwuka.epizy.com/jenadade.pdfIn PDF document text
    • http://mepojijolotezud.rf.gd/javazudumixasadopodur.pdfIn PDF document text
    • http://redadut.epizy.com/value_of_gas_constant_r_in_english_units.pdfIn PDF document text
    • http://topeleseluvon.rf.gd/zuvisom.pdfIn PDF document text
    • http://bexiponezewan.rf.gd/the_golden_tower_magisterium.pdfIn PDF document text
    • http://netojisabozop.rf.gd/evenflo_platinum_series_car_seat.pdfIn PDF document text
    • http://rumavajusugeg.rf.gd/atinga_nigerian_movie_free.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_off0000e177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE177 5216 bytes
SHA-256: a8a8c36e13d1ecc38be96988b0eacf6eae926966b3cdf89f64f76648e9a99484
font_01_sfnt_off0000f336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF336 10708 bytes
SHA-256: ae13cd29a01d42f173ce22fd4751106074760235b883435c43afb53442822688

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