Malicious PDF — malware analysis report

Static analysis result for SHA-256 a29953da9346b4fe…

MALICIOUS

PDF

105.3 KB Created: 2021-05-14 14:01:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: cec5785125eea2d0b8eb41f019210722 SHA-1: e8fcd87ca288ceba8db1b5d47fecc26e9404f072 SHA-256: a29953da9346b4fe6222ca08c54710d0201dc05d1ba9ab395b9d77c17398f878
126 Risk Score

Malware Insights

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

The file is a PDF containing numerous embedded URLs, many of which point to disposable domains and are indicative of a link farm. Heuristics indicate this is a link farm on disposable hosting, and ML classifiers and ClamAV strongly flag it as malicious, specifically as a phishing trojan. The document body, though heavily obfuscated, contains text related to leadership and references wkhtmltopdf, suggesting it's a lure document designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://zajinet.ru/strik?utm_term=why+is+leadership+an+art PDF link annotation
    • http://vekisonoloze.sportsontheweb.net/junior_basketball_court_dimensions_in_meters.pdfIn PDF document text
    • https://ligefunodimab.weebly.com/uploads/1/3/1/3/131398292/8403858.pdfIn PDF document text
    • http://takodevizol.iblogger.org/adventures_of_huckleberry_finn_original.pdfIn PDF document text
    • https://zawasofolebu.weebly.com/uploads/1/3/4/9/134902788/relovirujedegu-zagozezezeji-buvavuwilegaxe.pdfIn PDF document text
    • http://sethel.xyz/motorcycle_for_sale_near_me_under_1000_dollarsl6fr6.pdfIn PDF document text
    • http://xekokikimelaf.iblogger.org/sri_kshetra_adichunchanagiri_kannada_movie_songs.pdfIn PDF document text
    • https://wujibinofowe.weebly.com/uploads/1/3/1/3/131383737/16269f3f697.pdfIn PDF document text
    • https://kazusabetife.weebly.com/uploads/1/3/5/3/135318045/misimovugedulu-jopitejifofip-votapujopuk.pdfIn PDF document text
    • https://xififaxapid.weebly.com/uploads/1/3/4/3/134344339/1716336.pdfIn PDF document text
    • http://bhd-management.space/reporting_cronbach_s_alpha_in_tablenn6a9.pdfIn PDF document text
    • http://chtotakoeverti.biz/11595812930c9p8p.pdfIn PDF document text
    • https://difomojixi.weebly.com/uploads/1/3/4/3/134319012/123c17.pdfIn PDF document text
    • https://sajozigita.weebly.com/uploads/1/3/0/8/130814351/5046307.pdfIn PDF document text
    • http://silujokiz.mypressonline.com/10_class_biology_text_book.pdfIn PDF document text
    • https://pivozedotafi.weebly.com/uploads/1/3/1/0/131070355/5403115.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://molujafit.atwebpages.com/86591116134.pdfIn PDF document text
    • https://s3.amazonaws.com/wobuzisibal/gumotemomanigo.pdfIn PDF document text
    • http://siduxosezuk.rf.gd/79702718737.pdfIn PDF document text
    • https://s3.amazonaws.com/firigugixujotov/simevudekafawufekemimo.pdfIn PDF document text
    • https://s3.amazonaws.com/dalava/xovexarizabepirivugegu.pdfIn PDF document text
    • http://kefelogo.epizy.com/whats_the_best_carpet_cleaner_machine_to_rent.pdfIn PDF document text
    • https://s3.amazonaws.com/perurulexi/46164310033.pdfIn PDF document text
    • https://s3.amazonaws.com/sisaxu/83077378849.pdfIn PDF document text
    • http://duziroro.myartsonline.com/48114865363.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015f8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F8E 5164 bytes
SHA-256: 8de4bd6f1a77b616d10d1d30b80adf3fd85205c2b0a64e775491754389bb10d7
font_01_sfnt_off0001712a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1712A 11404 bytes
SHA-256: ad9ef383a2fe91c950d425aba496966aa7eb26fa3e0d3c5de80a87200bd42285

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