Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b72f61df822d4b2…

MALICIOUS

PDF

69.0 KB Created: 2021-03-03 07:08:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 106e2619bb6ff8238b64e0afa3cbeb14 SHA-1: 39b04b8e08f437976b1c958a3c0c623eefdcfaae SHA-256: 1b72f61df822d4b269baa2d64e6e196d912e27f7dc2744c27b0ed88301171ca1
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, indicative of a link farm designed to redirect users to malicious content. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing or trojan variant. The presence of external URIs and the link farm heuristic strongly suggest the document's purpose is to facilitate access to potentially harmful websites.

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://maypoin.ru/wix?keyword=prentice+hall+chemistry+laboratory+manual+answer+key PDF link annotation
    • http://tafakiduwav.scienceontheweb.net/how_to_set_the_time_on_my_citizen_blue_angels_watch.pdfIn PDF document text
    • http://idealica-ordina.site/pibozabajexugrowrg.pdfIn PDF document text
    • http://wersita.fun/zoxakawasekunebpb4gj.pdfIn PDF document text
    • http://tiwilofojifig.sportsontheweb.net/material_safety_data_sheet_for_chemicals.pdfIn PDF document text
    • http://tosefabebiribow.scienceontheweb.net/12857965458.pdfIn PDF document text
    • https://cdn.sqhk.co/lebapivi/yfifeWS/the_wolf_among_us_android_black_characters.pdfIn PDF document text
    • http://help-feedback-amzn6.xyz/how_do_you_write_a_mla_research_paper6x43g.pdfIn PDF document text
    • http://andyhongdigital.com/posukamedoliniefns.pdfIn PDF document text
    • http://xawegap.mywebcommunity.org/powerex_mh-c9000_manuale_italiano.pdfIn PDF document text
    • http://lazujifoxupa.getenjoyment.net/98602223878.pdfIn PDF document text
    • http://somixewavado.sportsontheweb.net/john_deere_js63_diagram.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/kaxukok/binamafutagu.pdfIn PDF document text
    • https://s3.amazonaws.com/belopudevuzuza/cinderella_2015_soundtrack_rar.pdfIn PDF document text
    • https://s3.amazonaws.com/resabomibogodaw/gaurav_agarwal_ias_marksheet.pdfIn PDF document text
    • http://zuputes.atwebpages.com/skyjack_3219_for_sale.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c4f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4F8 5320 bytes
SHA-256: 93000351907613ad5b90dd81fb5ff4cc6101da11a1c2cc475ac427f0dfd97868
font_01_sfnt_off0000d6e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E4 9796 bytes
SHA-256: 32aa5f2fb519cbae5d7c844b2942602cfbde789fb3913794c03287fbcd2f7d9a
font_02_sfnt_off0000f872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF872 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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