Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bf6fa5d1a0e8a80…

MALICIOUS

PDF

77.3 KB Created: 2021-02-09 15:57:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 9b6e0c1c207f7a69c09a823891d3c854 SHA-1: 9ecac153b0796ae616c42b61c30ab4ee8fbbdd30 SHA-256: 2bf6fa5d1a0e8a80d76b9f6303d525999851ed8d43432ec97922c6c2c6526020
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains a large number of embedded URLs, many pointing to disposable domains and configured as link farms, suggesting a phishing or malware distribution attempt. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of malicious intent, likely related to spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://seumenha.ru/123?utm_term=the+most+dangerous+game+book+audio PDF link annotation
    • http://idealsit.space/how_to_uninstall_checkpoint_endpoint_security_manually43uo0.pdfIn PDF document text
    • https://cdn.sqhk.co/xurazegoba/xdIjeKT/8466165821.pdfIn PDF document text
    • https://cdn.sqhk.co/nenuguvan/dgfgigc/fopufejumituxakez.pdfIn PDF document text
    • https://cdn.sqhk.co/pitewomepe/mx31igp/lotiwisejawovituge.pdfIn PDF document text
    • http://ital-girl.space/dubuvadbqsx0.pdfIn PDF document text
    • https://cdn.sqhk.co/tasiteregixo/JuDhihh/rudisomebunajitewiboviw.pdfIn PDF document text
    • https://cdn.sqhk.co/xolokenuw/5ibgcdv/arduino_ile_mini_sumo_robot_yap_m.pdfIn PDF document text
    • https://cdn.sqhk.co/tufuboloruj/tjdVgcU/hoop_stars_app_store.pdfIn PDF document text
    • http://pearhaidhr.fun/ruwek9ymnk.pdfIn PDF document text
    • http://tublitalia.space/stiletto_nails_color_ideasj9qeb.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/savifin/beaver_lake_fishing_report_washington.pdfIn PDF document text
    • http://jiwuwusa.epizy.com/friends_with_benefits_app_android.pdfIn PDF document text
    • https://s3.amazonaws.com/sefabe/rezorofulib.pdfIn PDF document text
    • https://s3.amazonaws.com/zifozujiwi/60696002062.pdfIn PDF document text
    • http://fufezexu.epizy.com/tezebu.pdfIn PDF document text
    • http://zewogukanonudut.epizy.com/39160926611.pdfIn PDF document text
    • https://s3.amazonaws.com/zuvovoxigumuz/cbre_thailand_hotel_report.pdfIn PDF document text
    • https://s3.amazonaws.com/xipavir/b._ed_exam_form_2018_ccsu.pdfIn PDF document text
    • https://s3.amazonaws.com/dujepav/dharamshala_weather_report_today.pdfIn PDF document text
    • http://rubipupajet.rf.gd/ceo_definition.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_off0000f28a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28A 5360 bytes
SHA-256: 2b51dfe671c50a40bc0ee3876225892aca6dfb0daf05557ea6f520827d1f7e55
font_01_sfnt_off00010496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10496 10412 bytes
SHA-256: 0dc7998940ef8aed256c360784c878bd3585f4fcc19c063d8687b27098a561f4

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