Malicious PDF — malware analysis report

Static analysis result for SHA-256 a19d1b7704958c6f…

MALICIOUS

PDF

128.0 KB Created: 2021-02-28 20:55:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 077b5f267014161e95597dfd092be05b SHA-1: c1e9ae18e7b10268f142dc00214809c127428a8e SHA-256: a19d1b7704958c6f37c30b65c1a252c8361c75c86c5b86f088eba875691d0c5e
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with several pointing to known malicious redirector infrastructure. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate a malicious intent to redirect users to harmful sites. While no scripts were explicitly extracted, the nature of the embedded links suggests a phishing or malware distribution attempt, likely initiated via a spearphishing attachment.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=the+earth+chronicles+pdf In PDF document text
    • http://kujunat.medianewsonline.com/varebezo.pdfIn PDF document text
    • http://kovuzaxaf.medianewsonline.com/notutojazidurufewod.pdfIn PDF document text
    • http://mitatizizuje.mypressonline.com/pathfinder_kingmaker_portraits_nsfw.pdfIn PDF document text
    • https://cdn.sqhk.co/zuvomafoda/iVibElo/1772018667.pdfIn PDF document text
    • http://agent-ritual495.online/wuxesipitofoguromfwjb6.pdfIn PDF document text
    • https://cdn.sqhk.co/xamozafi/ieLBBgh/amc_movie_stock_news.pdfIn PDF document text
    • https://cdn.sqhk.co/balaragu/kgfiegg/lenovo_ideapad_3_14ada05.pdfIn PDF document text
    • http://jefevivavifax.scienceontheweb.net/topumen.pdfIn PDF document text
    • http://misstourist.info/xcom_enemy_within_trainer_90409z6gl.pdfIn PDF document text
    • http://sethel.xyz/3539726927640mcl.pdfIn PDF document text
    • http://xepidenad.scienceontheweb.net/rain_dial_manual_run_all_stations.pdfIn PDF document text
    • https://cdn.sqhk.co/xolofiwano/Dhe5rjc/vulomapor.pdfIn PDF document text
    • http://tehnotop.space/spirit_of_the_laws_book_7_summarysfyw0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sitafefisoju.atwebpages.com/how_to_use_paint_in_ms_word.pdfIn PDF document text
    • http://vorisenunajix.myartsonline.com/the_city_and_the_city_book_review.pdfIn PDF document text
    • http://liraperuwuw.atwebpages.com/78016608278.pdfIn PDF document text
    • http://zepizevut.atwebpages.com/cual_es_la_mejor_biblia_catolica.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_off0001b829.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B829 5192 bytes
SHA-256: 0e817f40f43044499771957adbaf8784ed247846171cf75baaea4318c1801cfd
font_01_sfnt_off0001c9cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C9CC 11984 bytes
SHA-256: d07d7ad088c1aae7a8f53ec1116c2016444689a4be33a27139f8c28e0ab5f410

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