Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef5eb04668247cd1…

MALICIOUS

PDF

74.3 KB Created: 2021-03-01 18:32:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: f470d11d579cb9f64717075956d19f6f SHA-1: b02b66dfaec9e0a98a7f81a05558ef1c8df35b8c SHA-256: ef5eb04668247cd1f8ea04a797fdd336d7ac9e90504e251039a061913253879c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document is classified as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, appears to be a lure related to a search query, directing users to these malicious sites.

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://lozipotod.ru/strik?utm_term=how+to+find+the+area+of+a+triangle+trig PDF link annotation
    • http://natur-bio.space/34554512277hbkoa.pdfIn PDF document text
    • https://cdn.sqhk.co/vimerokil/gBCCPWK/xupogubogusis.pdfIn PDF document text
    • http://cherrypimp.online/texuze0fmid.pdfIn PDF document text
    • https://cdn.sqhk.co/wavagowew/ggigjcW/21682793130.pdfIn PDF document text
    • http://canonsburglake.com/pensive_noun_form5zu4i.pdfIn PDF document text
    • http://help-copyrightviolationhelpcenter.com/java_jdk_8_for_32_bituju5y.pdfIn PDF document text
    • http://topuniversityru.fun/what_is_archived_unearthed_arcanaur9v8.pdfIn PDF document text
    • https://cdn.sqhk.co/gepeduvo/zOjgUje/t_mobile_tuesdays_last_week.pdfIn PDF document text
    • http://bas-vorota.ru/avengers_movie_tamil_dubbed_tamilrockersy8wa5.pdfIn PDF document text
    • http://good-production18.site/vokojuzoluzv4scv.pdfIn PDF document text
    • https://cdn.sqhk.co/zijigemeworu/cSjihcJ/carrier_services_app_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/kobewudojuvo/ijgjOgf/verunazelojalekavore.pdfIn PDF document text
    • http://befotuke.mywebcommunity.org/balemajodelililore.pdfIn PDF document text
    • http://wisitens.online/way_of_retribution_awakening_apk_data96yeh.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/resisuna/faded_piano_sheet_music_hard.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

Related samples 3

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE567 5044 bytes
SHA-256: b4b1ba7ae2c141436021780c4832b227a39578e7f7debcce973e18a6f6b87729
font_01_sfnt_off0000f69a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF69A 11116 bytes
SHA-256: fc5da755405237e67466c89722f3f81c63473d76a24cfb82e893fb3f6fb20f75

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