Malicious PDF — malware analysis report

Static analysis result for SHA-256 a98f4535eb3a7eab…

MALICIOUS

PDF

74.1 KB Created: 2021-02-27 22:08:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 41d2e781652c718a4b132e39c660c558 SHA-1: 8e6e5283023a17ac2937addc94500c392d455da0 SHA-256: a98f4535eb3a7eab8b2213c6c4af5321d21b663a2d0712f0001c24187ff0902f
126 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics, including ML and ClamAV, indicating malicious content. It contains numerous embedded URLs, many of which point to disposable domains or link farms, suggesting a phishing or redirection attempt. The document body, though heavily obfuscated, appears to be a lure related to a search query, likely intended to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://zajinet.ru/strik?utm_term=what+were+the+4+empires+of+mesopotamia PDF link annotation
    • https://cdn.sqhk.co/xipapotug/cXhdqHf/loketoranasurigubone.pdfIn PDF document text
    • https://cdn.sqhk.co/duxadikoti/xtchhhi/84933979460.pdfIn PDF document text
    • https://cdn.sqhk.co/nejajevafode/Abg9jgn/used_mini_golf_drivers_for_sale.pdfIn PDF document text
    • https://cdn.sqhk.co/faroziwe/h34O6K8/blooms_taxonomy_verbs_list.pdfIn PDF document text
    • https://cdn.sqhk.co/wesebewoweva/gggohh8/yu_gi_oh_duel_links_download_pc_ita.pdfIn PDF document text
    • http://sellforce.ru/5863379487jwzb6.pdfIn PDF document text
    • http://3gusevshop.website/most_common_phrasal_verbs_in_english_exercisesy3nrg.pdfIn PDF document text
    • https://cdn.sqhk.co/pizokifuxe/Yihhct9/laviweseroj.pdfIn PDF document text
    • http://bejisosubonito.sportsontheweb.net/50212138567.pdfIn PDF document text
    • https://cdn.sqhk.co/gevajoke/ijiyhaW/photo_editor_pro_apple.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jofarasaxorepow.rf.gd/list_of_all_john_maxwell_books.pdfIn PDF document text
    • http://sikejilewiz.epizy.com/bike_racing_2019_mod_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/rujimidujek/bahubali_movie_naa_songs_com.pdfIn PDF document text
    • https://s3.amazonaws.com/xufaxoferugod/10464658147.pdfIn PDF document text
    • https://s3.amazonaws.com/tulosa/physical_science_class_9_in_bengali.pdfIn PDF document text
    • http://rerexewiruved.epizy.com/zodarefimakabaluge.pdfIn PDF document text
    • http://pekoguwomigurup.epizy.com/call_recorder_app_free.pdfIn PDF document text
    • https://s3.amazonaws.com/bejideba/73287278076.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_off0000e6bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6BD 5300 bytes
SHA-256: 9cc8377a87cd39e0c5dd88df5a3db6125b049cdf352ecf749057944b6a1cf4c8
font_01_sfnt_off0000f8b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B9 10304 bytes
SHA-256: a698d4559c659af92e5370bd870ec817dbf947bfd37821484e5bf0a2ece1133d

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