Malicious PDF — malware analysis report

Static analysis result for SHA-256 73b3aa30b49fdf7d…

MALICIOUS

PDF

76.4 KB Created: 2021-05-09 09:27:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: a580e4763e312f80747aaea744b3444c SHA-1: a33b9362e0d90134443023c7beafb56af181177a SHA-256: 73b3aa30b49fdf7db9e96185e2ef41d47b0a0ffdff4e68eb1531a3f541ee5d59
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, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a large number of links on potentially malicious or low-reputation hosting sites.

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://seumenha.ru/strik?utm_term=how+long+does+it+take+to+write+3+paragraphs PDF link annotation
    • http://lifeit.pro/dilugivudinij56fym.pdfIn PDF document text
    • http://funseeds.site/modern_combat_4_zero_hour_mod_apk_revdlk8lfn.pdfIn PDF document text
    • http://italiahot.space/ignou_ba_2nd_year_admission_formdgcg2.pdfIn PDF document text
    • http://makamar.tech/housekeeping_manager_job_descriptionojjtr.pdfIn PDF document text
    • http://tejafosiko.iblogger.org/appsc_general_studies_previous_papers_with_answers.pdfIn PDF document text
    • http://harmony-market.ru/dexemawuwilinadopuponad6310x.pdfIn PDF document text
    • http://lukanovetefitef.22web.org/glencoe_algebra_2_answers_chapter_5.pdfIn PDF document text
    • http://poroda.site/22566936479645ps.pdfIn PDF document text
    • http://gilezasewanima.iblogger.org/38190896211.pdfIn PDF document text
    • http://nijepatexosanus.medianewsonline.com/megewafopuwowibikob.pdfIn PDF document text
    • http://sexugaweguko.iblogger.org/s7_airlines_flight_information.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/lopeteb/67922779914.pdfIn PDF document text
    • http://dugerem.atwebpages.com/learning_management_system_research_papers.pdfIn PDF document text
    • https://s3.amazonaws.com/xamibebulosaxug/authorization_contract_template.pdfIn PDF document text
    • https://s3.amazonaws.com/zuses/32018615431.pdfIn PDF document text
    • http://tagijonegularol.myartsonline.com/harley_quinn_comics.pdfIn PDF document text
    • http://titetirif.epizy.com/junusujogepekota.pdfIn PDF document text
    • http://bojidalukin.epizy.com/45869120482.pdfIn PDF document text
    • http://sosekemuzunenu.rf.gd/29706512592.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_off0000ebcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCF 5500 bytes
SHA-256: 3e2e6db63abfe290bea9712bb91eaac84ac94ebd2feb532a7937685815a74a4e
font_01_sfnt_off0000fe95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE95 10616 bytes
SHA-256: 513ad7949b9073c20ae1d1ae07c08d60a3dd876d90e7f256303233234c5281d2

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