Malicious PDF — malware analysis report

Static analysis result for SHA-256 f29f89d7170c2e77…

MALICIOUS

PDF

89.3 KB Created: 2021-04-09 00:07:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: d660b97b4ac9072f1ddffa0605bd4896 SHA-1: 91954b457fdee10524dba9a60a99e28bf20d2460 SHA-256: f29f89d7170c2e77142c133b599b60abfacf41994a3d415a2405872c37ea5d1b
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically crafted to appear as a search result for a popular gaming headset. This, combined with the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic, strongly suggests a phishing or malware distribution attempt. The ML classifier and ClamAV detection further corroborate the malicious nature of the file.

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://mezovuduw.ru/strik?utm_term=how+to+get+turtle+beach+headset+to+work+on+fortnite PDF link annotation
    • http://xifuponek.iblogger.org/how_to_start_a_comparative_analysis_essay.pdfIn PDF document text
    • http://rubka.space/362022240270jesr.pdfIn PDF document text
    • http://usesol.xyz/bawogupebefile75062.pdfIn PDF document text
    • http://bilapak.66ghz.com/bede_sixth_form_stockton.pdfIn PDF document text
    • http://poxumanavofeboz.scienceontheweb.net/xexetivoludipepibaxibexi.pdfIn PDF document text
    • http://insurancesouk.com/dopumawitugomxf1p1.pdfIn PDF document text
    • http://lovechat24.club/what_is_the_best_mig_welder_for_a_beginner5rb90.pdfIn PDF document text
    • http://mibilivo.scienceontheweb.net/xasiga.pdfIn PDF document text
    • http://uspex22.online/79337901335rngtj.pdfIn PDF document text
    • http://zonitupupafof.sportsontheweb.net/social_demography_in_sociology.pdfIn PDF document text
    • http://kavelokafozi.medianewsonline.com/madame_bovary_window_quotes.pdfIn PDF document text
    • http://risonubokedoxav.scienceontheweb.net/sexusuxetewib.pdfIn PDF document text
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdfIn PDF document text
    • http://nekidifuton.medianewsonline.com/65275450711.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rexefobixavater.myartsonline.com/what_is_the_best_portable_air_conditioner_with_dehumidifier.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70c77ff2-19f1-4389-b359-84e0e2f253e6/schlage_camelot_handleset_satin_nickel.pdfIn PDF document text
    • http://mimewimirul.rf.gd/mapajinezororovo.pdfIn PDF document text
    • http://jezirateba.rf.gd/dikazoxabupedinawet.pdfIn PDF document text
    • http://pawepeg.atwebpages.com/arduino_due_specs.pdfIn PDF document text
    • http://linanimeb.rf.gd/83691293904.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf180e64-ff3e-422a-85e7-3d9288fae252/firusupeguvutomur.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_off00011871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11871 5540 bytes
SHA-256: 85b4285f026561ed55259f72faa81089773a36f2389434ad9adadcbaa329cda7
font_01_sfnt_off00012b53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B53 13644 bytes
SHA-256: 82cb4e003feafe42c90e73374120b7bb9f28a11e030359ef43118143456cff56

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