Malicious PDF — malware analysis report

Static analysis result for SHA-256 e754a6ad957dfcf6…

MALICIOUS

PDF

74.2 KB Created: 2021-02-16 05:23:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 62461b5cac939dc17bd41957dd9300a4 SHA-1: 38c3f3afd4f1561e8f63cd47c10e75bab7d6b946 SHA-256: e754a6ad957dfcf687c924bcaebaa6ae22f411c23e20e21fd85fb69d2c78eb71
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs pointing to various domains, many of which are associated with link farms and disposable hosting, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates a pattern of using such domains to obscure the final malicious destination.

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://bologen.ru/strik?utm_term=how+to+open+a+fire+safe+sentry PDF link annotation
    • https://cdn.sqhk.co/genopeno/dgggiX9/easy_load_motorcycle_trailers_for_sale.pdfIn PDF document text
    • http://introdom.ru/ninja_parkour_vector_323zhg.pdfIn PDF document text
    • http://agreevudb.rest/porcentajes_de_las_bases_nitrogenadas_del_adnjf5yg.pdfIn PDF document text
    • https://dizivabuzazelu.weebly.com/uploads/1/3/4/0/134017784/4021281.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474746/normal_5fcd584c74acf.pdfIn PDF document text
    • http://qrettalq.online/llama_in_my_living_room_songzedx1.pdfIn PDF document text
    • https://judexesadizit.weebly.com/uploads/1/3/0/7/130738912/af210cc2cf9050.pdfIn PDF document text
    • https://ditixalopu.weebly.com/uploads/1/3/1/4/131410538/xegopixijesurum.pdfIn PDF document text
    • https://cdn.sqhk.co/fexilejedit/hcicPZp/learn_drums_app.pdfIn PDF document text
    • https://cdn.sqhk.co/japexexuko/Rsjanid/tucson_gem_mineral_show_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/mitukutowum/0hjnjiQ/livesisu.pdfIn PDF document text
    • https://cdn.sqhk.co/kiribikiv/PYsPOid/likee_download_windows_10.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mefovu/pembina_valley_online_winkler_police_report.pdfIn PDF document text
    • https://s3.amazonaws.com/wegugus/abide_sentence_formation.pdfIn PDF document text
    • https://s3.amazonaws.com/leributafa/beautiful_disaster_series_free.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_off0000e7ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7CA 5016 bytes
SHA-256: c66c2f1b63865904ad614487ac6769f7f60c4b079c8f7d772c0118535ed0582b
font_01_sfnt_off0000f906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF906 10128 bytes
SHA-256: f86fecb6cf4d03ea29a69240457f8cb6a6e8b8e25a20c1a323f37c6c17105513

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