Malicious PDF — malware analysis report

Static analysis result for SHA-256 f026da664ee02ac6…

MALICIOUS

PDF

82.4 KB Created: 2021-03-02 06:44:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 81f9c41759b6bae3e3fc33d0fbfc33df SHA-1: 94e75a016ce3abe6f13b3dff26a9f669834cccd5 SHA-256: f026da664ee02ac64cc59634a3ddc7d73ec5f90ff3dd8456f555590048bd925e
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 0.9998

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://druttle.ru/123?utm_term=what+are+the+tools+used+to+collect+primary+data PDF link annotation
    • http://xufededubumavif.scienceontheweb.net/povet.pdfIn PDF document text
    • http://zonizubiro.getenjoyment.net/nexawatakemobepini.pdfIn PDF document text
    • http://wide-take.top/109747113833w2j1.pdfIn PDF document text
    • http://chaptejvxz.fun/13483736391ikuom.pdfIn PDF document text
    • http://themarkuzmusic.com/9577870818yta51.pdfIn PDF document text
    • http://guitar.su/nigofogupaegant.pdfIn PDF document text
    • http://lezeninimi.medianewsonline.com/fundamentals_of_physics_11th_edition_reddit.pdfIn PDF document text
    • http://tiwirodizefa.iblogger.org/argos_bedroom_bed_sheets.pdfIn PDF document text
    • http://josumewemuzob.getenjoyment.net/50824460618.pdfIn PDF document text
    • http://dirtygirl.fun/vekigijuzuecjz.pdfIn PDF document text
    • http://shop-kid-toys.online/how_do_i_reset_my_samsung_dw80k5050us_dishwasherddreu.pdfIn PDF document text
    • http://bikomowaxibujoj.medianewsonline.com/bovevevewugugebilidabu.pdfIn PDF document text
    • http://wumewil.sportsontheweb.net/tipofenarudezapavulemej.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/ninasivol/cannery_row_chapter_1-5_summary.pdfIn PDF document text
    • http://lijowavatajo.myartsonline.com/an_enquiry_concerning_human_understanding_full_text.pdfIn PDF document text
    • https://s3.amazonaws.com/buponuwebi/faringoamigdalitis_viral_y_bacteriana.pdfIn PDF document text
    • http://vidugozu.atwebpages.com/sylvia_plath_fig_tree.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF738 5204 bytes
SHA-256: 8e4c68333445258629d78e402c5294807150fcce6993532b40857fc11835afa0
font_01_sfnt_off000108f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F9 10856 bytes
SHA-256: 2ae3be2dc9e19d25d32f1bd02a78c01a4268017f13a57ea79d0acbdefdf07cf8
font_02_sfnt_off00012dd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DD0 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34