Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4b2c7eb43af95f0…

MALICIOUS

PDF

79.0 KB Created: 2021-03-30 13:00:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 14b18c78ad94933d06a4f0009dec13d4 SHA-1: c98c803038354d664f223c130235e234b1d00b7a SHA-256: e4b2c7eb43af95f0c33b96306980bdf076b83f269e875558795df141d3013bf8
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan distribution attempt. It contains numerous embedded URLs, with several pointing to unknown or potentially malicious domains, suggesting it acts as a link farm to redirect users to further malicious content. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDF documents from web content, further supporting a lure-based attack.

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://cdn.sqhk.co/negolura/Fha4hgI/we_are_crossing_the_water_chords.pdf In PDF document text
    • http://autoport76.online/copper_sheet_splashback_ukr6ibw.pdfIn PDF document text
    • http://study-english-02.space/skyrim_dark_brotherhood_night_mother_coffin_glitchvbpvh.pdfIn PDF document text
    • http://wwnews.site/free_equipment_log_book_template_excelt3izz.pdfIn PDF document text
    • https://cdn.sqhk.co/vakolitakap/ieMijLs/gaxuwodatupetow.pdfIn PDF document text
    • https://cdn.sqhk.co/pixisuja/cNCggI7/fedinebaxulubedopako.pdfIn PDF document text
    • http://makamar.online/93984724407hwthw.pdfIn PDF document text
    • http://item-get.top/fedex_ground_clarksburg_wvfqb32.pdfIn PDF document text
    • https://cdn.sqhk.co/rabataxuvax/qG0iikK/83959611193.pdfIn PDF document text
    • http://ig-copyrighthelpcenter.com/40_book_challenge_rewards0aa7l.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://feedproxy.google.com/~r/wb/ENAH/~3/KjdSuPfhPRY/wb?keyword=why%20do%20i%20find%20menPDF link annotation
    • https://ebd73b9a-b255-48a5-b781-2bd84b483b4c.filesusr.com/ugd/956c05_10a3b286fed64d27acc30393ecd8efb4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jiwisi/charles_bronson_filmes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/991b7cac-e1de-49c1-817e-ec5c834f2b64/how_does_plate_boundaries_cause_earthquakes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/342189a3-5f52-4213-8339-e25baf581ab4/88338277263.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/962c4ad1-62aa-415b-9e96-779eaffbc8e4/how_to_get_rid_of_bloating_from_binge_eating.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabisura/burp_cloth_template_printable.pdfIn PDF document text
    • https://s3.amazonaws.com/dogazisuze/jio_movies_telugu_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/savifin/67179231367.pdfIn PDF document text
    • https://9c43cb74-45e3-47de-9527-fda2e8336169.filesusr.com/ugd/af0aa9_1cb67cec499446c28ab1ff293ca8c461.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cad8daf5-ca73-4355-8249-1d1161d5666f/lifesource_ua-767_plus_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/xidulumexi/conflict_resolution_styles_in_relationships.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_off0000f86d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF86D 5436 bytes
SHA-256: 43c103a62438e6e70d587967b60787f7cfbd81b9b17ea4b277c081b900ea53b3
font_01_sfnt_off00010ae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE5 10616 bytes
SHA-256: 7c963c3d0f301a5ce5c8e044460e4225ebc40122a83004268d5b0019a6b33419

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