Malicious PDF — malware analysis report

Static analysis result for SHA-256 d58a30659208b279…

MALICIOUS

PDF

75.0 KB Created: 2021-04-02 16:13:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 0d15adb919ad0040a1ac7d3b970616fd SHA-1: 8ac71be3ff2aa1cd6ec4c5a0f308f31230d853a2 SHA-256: d58a30659208b27931b729dae0e4713ee26402ace7aa82cd8df8944d75ee68a1
166 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 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://dugedepap.ru/123?utm_term=nice+guidelines+botulinum+toxin+spasticity PDF link annotation
    • http://wuzagabi.22web.org/11800706122.pdfIn PDF document text
    • http://draiwenstore.online/which_braun_silk_epil_is_the_best4uu1h.pdfIn PDF document text
    • http://gbarb.me/essential_oils_pocket_reference_guidedma3f.pdfIn PDF document text
    • http://7evenrp.ru/pentair_intellichlor_cleaningnafrs.pdfIn PDF document text
    • http://fortuneo-enligne.com/gta_vice_city_game_password_freedund3.pdfIn PDF document text
    • http://voirlo.xyz/capitalization_worksheet_for_1st_grader9y3a.pdfIn PDF document text
    • http://managerprogram.live/super_pixel_heroes_2019_apkfl43y.pdfIn PDF document text
    • http://se-mrush.com/ramatojilutogdxjz.pdfIn PDF document text
    • http://guwidibedebom.22web.org/asbabun_nuzul.pdfIn PDF document text
    • http://vehicleusains.com/john_dewey_experience_and_educationq5pni.pdfIn PDF document text
    • http://medyahanem.com/motorguide_trolling_motor_repair_partsbsqd2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://luvugotanufulav.epizy.com/gerizevatabovagag.pdfIn PDF document text
    • http://wepaxilex.epizy.com/star_wars_trumpet_sheet_music_easy.pdfIn PDF document text
    • http://vibupozikijebi.rf.gd/ce_declaration_of_conformity_sample.pdfIn PDF document text
    • http://rurodebijusidof.epizy.com/duwidipefopikarafofufa.pdfIn PDF document text
    • http://zetipetarot.rf.gd/nuzovosi.pdfIn PDF document text
    • http://poxogebowa.epizy.com/39702371930.pdfIn PDF document text
    • http://rakemexovujepez.epizy.com/ad_agency_internship_report.pdfIn PDF document text
    • http://fasokefukolu.epizy.com/femimulowenokimujewimu.pdfIn PDF document text
    • http://bujegijuv.rf.gd/roxusazopudujosexawozal.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_off0000e63f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE63F 5576 bytes
SHA-256: 03df505502be931897267d4627566ddcbff2e755fa57d345e00705ee70438289
font_01_sfnt_off0000f937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF937 10368 bytes
SHA-256: 06d3ed4f10296615a4166d8d496b4ff67dce618ae3b7165f60e19d7aac8aebc2