Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce744b688b856ffd…

MALICIOUS

PDF

69.8 KB Created: 2021-02-26 05:40:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: da081146293573770a714ddc4dc015aa SHA-1: 23422edbb7feadf1e59826a8d259b20692089c3a SHA-256: ce744b688b856ffd847bfda997cbda6ff8aa4b50bcaf920fead24f3ba3bce765
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous embedded URLs, many pointing to disposable domains and one using a UTM term redirector, strongly suggests a phishing or malware distribution campaign. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious 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://jottigo.ru/strik?utm_term=nelson+stud+welding+systems+equipment+%2526+fasteners PDF link annotation
    • http://mufutekuson.getenjoyment.net/wejologeb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386609/normal_60185d994e8e2.pdfIn PDF document text
    • http://lifeit.pro/audio_converter_crackd7spf.pdfIn PDF document text
    • http://xelapelumu.iblogger.org/teaching_english_as_a_second_language_certification.pdfIn PDF document text
    • http://gadetebes.sportsontheweb.net/4606019761.pdfIn PDF document text
    • http://gedadekenoz.mywebcommunity.org/how_do_you_prepare_for_a_competency_based_interview.pdfIn PDF document text
    • http://b4shop.icu/jeopardy_dankey_kang_answer2b6ux.pdfIn PDF document text
    • http://avit0.cc/80293392553ckgdx.pdfIn PDF document text
    • http://zonerokemub.getenjoyment.net/how_to_get_a_vet_assistant_certificate.pdfIn PDF document text
    • https://cdn.sqhk.co/sejiragidu/jf3wH6P/tumblr_couple_photography.pdfIn PDF document text
    • http://vijexibat.mywebcommunity.org/48615238566.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pomagupivedib.epizy.com/ankhon_dekhi_full_movie_filmyzilla.pdfIn PDF document text
    • http://nukilaba.myartsonline.com/do_all_oral_b_brush_heads_fit.pdfIn PDF document text
    • http://wuparol.epizy.com/zovamufupasezodovitezixu.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_off0000d293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD293 5260 bytes
SHA-256: 88a409ef6e649d29ef02be08d889b33ae8f6202f11f2bfb5f3b0393c12f435cf
font_01_sfnt_off0000e485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE485 10944 bytes
SHA-256: a63f6ff693a26c72d50271536f510bbc2f6e32efb870071ed960fe5f6ad6baf6

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