Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c5437db92e8467e…

MALICIOUS

PDF

72.7 KB Created: 2021-03-16 18:20:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5da58f8ba0fa399f39de34dd117d837c SHA-1: 57637b44f8fc03fbcc65a482b20d9bd2be844d33 SHA-256: 5c5437db92e8467e3b7421ba8f4a14315f2f101a913c5bf763668face5142e21
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URI that directs the user to a suspicious domain, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URI suggest it's designed to exploit users by masquerading as a legitimate document to redirect them to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://vilenefex.ru/wix?keyword=directed+reading+volcanoes+and+plate+tectonics+answer+key
    • https://cdn-cms.f-static.net/uploads/4500189/normal_5fe98ea819f94.pdf
    • https://cdn-cms.f-static.net/uploads/4365586/normal_602bfbdc05940.pdf
    • https://cdn.sqhk.co/virawamimozi/jcGGwFW/barbarian_bis_guide.pdf
    • http://ritual-venki.online/how_to_use_tiger_electric_rice_cooker_japano8ruk.pdf
    • http://lnstagramverifiedbadgeservice.com/dijogelazelivixopovkesz0.pdf
    • http://goldstein.capital/what_is_the_best_fpv_drone7wnu9.pdf
    • https://cdn.sqhk.co/goronikel/LxjaEts/write_notes_on_ipad.pdf
    • http://medicinfo.online/44076240514b0wgr.pdf
    • https://jujoxiro.weebly.com/uploads/1/3/4/8/134875196/zisoba-faburolek-sefowuderu.pdf
    • https://static.s123-cdn-static.com/uploads/4393019/normal_6000c3b963116.pdf
    • http://helpcenter.business/juegos_cristianos_para_niosnqmg2.pdf
    • https://magazeja.weebly.com/uploads/1/3/5/9/135990405/mepekanidadibemis.pdf
    • https://static.s123-cdn-static.com/uploads/4449424/normal_5fc5da59602eb.pdf
    • https://cdn-cms.f-static.net/uploads/4454422/normal_5fd3075cbb525.pdf
    • https://nokajadum.weebly.com/uploads/1/3/4/8/134887388/4465423.pdf
    • https://bopojebokup.weebly.com/uploads/1/3/1/4/131408204/acb4ad9d.pdf
    • https://cdn.sqhk.co/sudagewas/WgfjcIk/rectangular_to_polar_form_matlab.pdf
    • https://cdn.sqhk.co/mewowoji/ya0hiJy/noirmont_tower_jersey.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://d80868e2-5d34-4dda-9345-0396294a35aa.filesusr.com/ugd/f9fac6_339c6adf42b346eaa0b1e332e4dce954.pdf?index=true
    • https://12f7643e-9106-4823-89c2-0bdaecd1bc22.filesusr.com/ugd/1f6d71_7d7178ace5cc451887a369e4fe961e38.pdf?index=true
    • https://a84030a7-2e48-4039-807a-383e2b7216cc.filesusr.com/ugd/c5d40f_2a4ea63067824265aaa0ab082be65060.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df23.bin
01c6fd357bc7a78fbe032c15de1beb0df5017756ba86ff078e1a4ef58c9e296a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF23 5560 bytes
font_01_sfnt_off0000f243.bin
564780387d03c70fd884233f0947e0e79ee3115bb535bc4fc7e3911614417652		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF243 10196 bytes

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