Malicious PDF — malware analysis report

Static analysis result for SHA-256 41cc6ac3dc51964a…

MALICIOUS

PDF

80.0 KB Created: 2021-03-27 18:45:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 16985ff4f81798983213d2e400fe34cd SHA-1: ed78ffbd43c5465917495b91f1857ea374f2930d SHA-256: 41cc6ac3dc51964ab729321f725e090bbaae812371a61366a5889ce3b4b14702
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://gimoguvi.ru/123?utm_term=separation+anxiety+disorder+treatment+guidelines PDF link annotation
    • http://woodbonus.net/dell_1320c_toner_chip_resetjs2xb.pdfIn PDF document text
    • http://vovality.club/wordpress_cms_website_templates_freenb576.pdfIn PDF document text
    • http://aov.one/airplane_mode_logan_paul_movie0v4my.pdfIn PDF document text
    • http://coolstudent.space/19937234375vrs39.pdfIn PDF document text
    • http://golosa-spasibo.ru/twilight_breaking_dawn_part_1_google_driveuo2vw.pdfIn PDF document text
    • http://xabibumat.iblogger.org/rocket_league_cross_platform_xbox_one_ps4.pdfIn PDF document text
    • http://lakcherie.ru/hp_officejet_8610_printhead_missing_error7ca7z.pdfIn PDF document text
    • http://rollernefrit.xyz/brinks_home_security_system_manualbim10.pdfIn PDF document text
    • http://spiritstudio.ru/influencer_marketing_2020_report4x4e1.pdfIn PDF document text
    • http://vorecan.space/zodudedegokoto749mw.pdfIn PDF document text
    • http://idealicacolumbia.site/46834796082d2oj4.pdfIn PDF document text
    • http://libralab.digital/top_10_books_on_fundamental_analysis4buvo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/sajatofubote/63028278989.pdfIn PDF document text
    • http://zakamizorone.rf.gd/78032160399.pdfIn PDF document text
    • http://debarunuzijabe.rf.gd/71830315592.pdfIn PDF document text
    • https://s3.amazonaws.com/betefowubevat/adobe_premiere_rush_android_apk_mirror.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxalowafokuvo/62004996863.pdfIn PDF document text
    • https://s3.amazonaws.com/nevovumowa/dasalujepevu.pdfIn PDF document text
    • http://ronojegev.rf.gd/9260743511.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d719.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD719 5432 bytes
SHA-256: cb7af273c5e4a7a85a9a57c846450139755259d1a69ccb1dbc6dc347cbf2476c
font_01_sfnt_off0000e97e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97E 10844 bytes
SHA-256: 2aa65e5ff494ee67592c051e0ec6170101d0eef2a20a73a63204665834c89f94
font_02_sfnt_off00010ed5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED5 16232 bytes
SHA-256: b70fafebd2aa5a43688c017d4d37073e0fd893ff325c800f910a2bd4a454f3d1
font_03_sfnt_off00012434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12434 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2