Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c5c3acb87849158…

MALICIOUS

PDF

65.2 KB Created: 2021-01-21 17:36:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 4e97220fa0264d0c9e15600f72cb3da5 SHA-1: edd97b40d422db2ee03ae29e514b2953988068ab SHA-256: 6c5c3acb878491581b886332cc6e673382287e903a325e3fb06af9e69746adfe
126 Risk Score

Malware Insights

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

The file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and embedded content point towards an attempt to redirect users to malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffnew.ru/123?utm_term=extra+wide+curtain+panels PDF link annotation
    • https://cdn.sqhk.co/wetiniwem/jfhgihW/thorax_muscles_labeled.pdfIn PDF document text
    • http://tularafujebok.iblogger.org/39978106737.pdfIn PDF document text
    • https://cdn.sqhk.co/zenetofuma/S0LUXhJ/oneplus_7t_latest_news.pdfIn PDF document text
    • http://sojuvofud.22web.org/android_splash_screen_template_psd.pdfIn PDF document text
    • http://sezewadiwun.22web.org/uk_consulting_industry_report.pdfIn PDF document text
    • https://site-1171989.mozfiles.com/files/1171989/33342966569.pdfIn PDF document text
    • https://cdn.sqhk.co/ruduligived/ih0hcjj/the_last_of_us_2_wallpaper_4k_android.pdfIn PDF document text
    • https://cdn.sqhk.co/puzokopu/xXkgfja/varobinaxaxelize.pdfIn PDF document text
    • https://cdn.sqhk.co/mutobudenit/agihj3V/fun_facts_about_costa_rica_culture.pdfIn PDF document text
    • https://site-1251696.mozfiles.com/files/1251696/ird_individual_tax_return_guide_2019.pdfIn PDF document text
    • https://site-1175227.mozfiles.com/files/1175227/best_breakup_books.pdfIn PDF document text
    • https://site-1174957.mozfiles.com/files/1174957/wudijofefedurejipekogil.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pixutixiziv.epizy.com/9670610093.pdfIn PDF document text
    • https://s3.amazonaws.com/zuvovoxigumuz/60078142297.pdfIn PDF document text
    • http://pigozezidum.rf.gd/cmcsa_earning_report_date.pdfIn PDF document text
    • https://s3.amazonaws.com/xedewofuretujo/nipevexogomusidipabikido.pdfIn PDF document text
    • http://bosirizowu.rf.gd/adobe_premiere_rush_cracked_apk.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 8

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_off0000c0f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0F2 5184 bytes
SHA-256: 23fea4f0b4c46a48e1aa344382b4076f480e5cd7992e2bd53151ab1b376aa5c6
font_01_sfnt_off0000d2ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2BA 10784 bytes
SHA-256: d29d70cbfb97f1b69210e782dcb4a1581c295b8a049fc19dc1da1d8e190868aa

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