Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dafbcc2343a3794…

MALICIOUS

PDF

74.1 KB Created: 2021-03-19 17:04:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b48cd5e79f7063bb9c1373fa33953ff5 SHA-1: e12f2621cc61367e5545f93054f8fc7aa417e637 SHA-256: 3dafbcc2343a3794494e5b7b51422590c5da812c589ab86c25c4af58c3c806ce
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/wix?keyword=sending+invoice+cover+letter PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4461484/normal_5fecd4f496974.pdfIn PDF document text
    • http://raisinshq.club/16471974415dyqf7.pdfIn PDF document text
    • http://distornyup.site/chamberlain_universal_keypad_wont_programue1mj.pdfIn PDF document text
    • http://docita.fun/favenoporuwomes0.pdfIn PDF document text
    • http://idealica-official.website/govuwuzuvutukuribg4ts9.pdfIn PDF document text
    • http://wupuluku.22web.org/lujazojikaxuvuwefuzapad.pdfIn PDF document text
    • http://vinadulateg.22web.org/any_admin_3._7.pdfIn PDF document text
    • http://6gusevshop.website/epson_xp_424_printing_blank_pagesysirv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379231/normal_5fe713f230b16.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/26db6aa8-eec1-46b8-a7ab-1189b4d5ca0f/skyline_nomad_travel_trailer_for_sale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb9787cc-d6ee-4c52-b76d-af20a450e8f3/zowanik.pdfIn PDF document text
    • https://s3.amazonaws.com/tisegovofu/geometry_dash_vault_of_secrets_all_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/rizijubovapuk/audio_naat_sharif.pdfIn PDF document text
    • http://novegiw.rf.gd/the_power_of_love_lyrics_huey_lewis_meaning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d631e34f-e390-458c-b990-6797804bba9e/wanabunakefofumikiw.pdfIn PDF document text
    • http://gufogima.epizy.com/duxexofagi.pdfIn PDF document text
    • http://retukazitoja.epizy.com/free_avg_antivirus_pro_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/duzexefemosaxe/climate_change_report_united_states.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b3a709e-493d-443b-bf3b-e9c5906d62d6/child_care_plan_template_uk.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_off0000ea4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4D 4884 bytes
SHA-256: d6115d90df08fbc26dab66fc49c7307e44f7ca1b65c2c88ac8c822a2a787dede
font_01_sfnt_off0000fb05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB05 9456 bytes
SHA-256: 7975439f0651f59ffe75e83da92030cd8ecd39ae7c9ffafd205d83fc7afee715