Malicious PDF — malware analysis report

Static analysis result for SHA-256 4580ed4105b8eb7a…

MALICIOUS

PDF

93.3 KB Created: 2021-04-22 08:43:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: f905eddefd08ada6bdac9ced03f50225 SHA-1: b08462512859918aef592e8fcf5b26f30ead419e SHA-256: 4580ed4105b8eb7acf0694d365a25cf53ab99be947462eafbd64b21b7f9d1463
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 0.9997

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://vilenefex.ru/strik?utm_term=does+the+v+shred+diet+work PDF link annotation
    • https://cdn.sqhk.co/muzorefu/gf3jfih/real_bike_cycle_racing_3d_apk.pdfIn PDF document text
    • http://dotugigobeje.iblogger.org/8310787615.pdfIn PDF document text
    • http://hdvideo.design/mufevepovenisisotizajefgqri.pdfIn PDF document text
    • https://cdn.sqhk.co/vijukifezu/OcgeQOs/wish_memes_funny.pdfIn PDF document text
    • http://figebofisekozoj.22web.org/icloud_password_format.pdfIn PDF document text
    • http://puzofogerexiwi.22web.org/ridamatoxixanujezufe.pdfIn PDF document text
    • https://cdn.sqhk.co/norasoketika/gdggJhj/asrock_x570_phantom_gaming_4_wifi_manual.pdfIn PDF document text
    • http://labiosdewonda.com/petsafe_indoor_radio_fence_instructionsva7fn.pdfIn PDF document text
    • http://perevozka.ru/14941111287wqv6n.pdfIn PDF document text
    • http://jushq.pro/nitutih3ku6.pdfIn PDF document text
    • http://kleomaften.online/94191954110jjtax.pdfIn PDF document text
    • http://genonobamubus.22web.org/aha_acls_algorithms.pdfIn PDF document text
    • https://nifevokore.weebly.com/uploads/1/3/1/4/131437532/2356783.pdfIn PDF document text
    • https://kisewosa.weebly.com/uploads/1/3/1/0/131070890/9188301.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
    • http://sikofus.epizy.com/the_elder_scrolls_v_skyrim_dragon_language_translator.pdfIn PDF document text
    • http://fizaveloxuraje.rf.gd/55938943304.pdfIn PDF document text
    • http://xamudakosenezi.rf.gd/acid_fast_staining_procedure.pdfIn PDF document text
    • http://sexililelaweru.rf.gd/reference_page_in_apa_format_6th_edition.pdfIn PDF document text
    • http://lisotabisalak.epizy.com/appraisal_report_template.pdfIn PDF document text
    • http://xobagoxefe.rf.gd/76779923971.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_off000120c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C2 4568 bytes
SHA-256: 62d2f2544117d1ebbb9f54575c564cf2639f342b33bf82ff6551af51ccce4fa4
font_01_sfnt_off00013073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13073 11504 bytes
SHA-256: 1d54820b7e9cf6697b117c4f4bdff6bbc2873d43399681163128954c4d32738e
font_02_sfnt_off000157b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157B4 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34