Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c17bcbde180f798…

MALICIOUS

PDF

76.7 KB Created: 2021-04-04 04:54:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 326e592ddfe9858fd674b02e1a8b97da SHA-1: c8ceb1f4728883247d3afb0bf94b6305797fd79c SHA-256: 6c17bcbde180f798c2d4c20d6c3576a849e0200087c57f57fe014568890139f0
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://golowaki.ru/strik?utm_term=what+is+ip+address+and+subnet+mask+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4408187/normal_604420fa53449.pdfIn PDF document text
    • http://titofiz.22web.org/asphalt_8_airborne_cheat_engine.pdfIn PDF document text
    • http://joxutodotuwosej.22web.org/degradacion_del_medio_ambiente.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502336/normal_601f1283b9241.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369498/normal_5fc88ea5366bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450003/normal_602e4baca99e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422918/normal_60635b9c2f00f.pdfIn PDF document text
    • http://vojituvidur.iblogger.org/best_website_for_learning_english_speaking.pdfIn PDF document text
    • http://lujakivuvig.22web.org/cure_for_glioblastoma_multiforme.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402948/normal_606779e24e833.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481056/normal_6061dd4a819a2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fajufavutipo.epizy.com/blender_2._8_windows_10.pdfIn PDF document text
    • http://vaxokepa.rf.gd/level_42_impossible_quiz_answer.pdfIn PDF document text
    • http://nejoselox.epizy.com/95835585496.pdfIn PDF document text
    • http://zakutipatijike.rf.gd/brain_entrainment_apps_android.pdfIn PDF document text
    • http://kefelogo.epizy.com/535281321.pdfIn PDF document text
    • http://nixunemekatim.rf.gd/stepper_motor_applications.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_off0000eeea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEA 5468 bytes
SHA-256: 73a79eeb02c291aa477b8aeef9816b6d814e1e89ecf57fbd1efb16b980c6f1d5
font_01_sfnt_off00010158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10158 10660 bytes
SHA-256: f414d47532e4c0a5f99f328d1744fddab555775f41093efc9d3b0cc295d2a187