Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca159a68eefa8f21…

MALICIOUS

PDF

78.4 KB Created: 2021-03-24 15:19:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7a610e58762ab41647c92a5a44d8e376 SHA-1: b3f2a73b4b3baa077267920f33bd4174827350e6 SHA-256: ca159a68eefa8f214f09674a2d747193d0dade40f1ba24935ef189c96485a6d6
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are part of a link farm designed to appear as teaching resources. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded JavaScript, though not directly analyzed for specific actions, suggests a mechanism for further exploitation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://seumenha.ru/wix?keyword=hitchhiker%2527s+guide+to+the+galaxy+free+teaching+resources
    • https://cdn-cms.f-static.net/uploads/4417645/normal_6017a4529e6b5.pdf
    • https://cdn.sqhk.co/zitibidino/jfigSKQ/sunbeam_trailer_products_inc.pdf
    • https://cdn-cms.f-static.net/uploads/4384828/normal_600d44b70a2b4.pdf
    • https://cdn.sqhk.co/lojadisexudo/Qjb5gcR/ftdi_232_driver_linux.pdf
    • http://zagupoxeson.iblogger.org/ejemplos_de_causa_y_efecto_en_oraciones_para_nios.pdf
    • https://cdn.sqhk.co/zetuzire/entMZge/wildcraft_animal_sim_online_3d_apk.pdf
    • http://vagebunav.iblogger.org/how_to_service_rainsoft_system.pdf
    • https://toredakiwireg.weebly.com/uploads/1/3/0/7/130739366/3ae5494e8.pdf
    • https://static.s123-cdn-static.com/uploads/4387808/normal_5fe060a382417.pdf
    • https://wibakaxidame.weebly.com/uploads/1/3/2/7/132741334/xemewit_bizamazil_labadu_kobokalomib.pdf
    • http://botumizesakukij.iblogger.org/samexuzaga.pdf
    • https://cdn.sqhk.co/dofewijoras/98ejjgi/map_of_united_kingdom_and_europe.pdf
    • https://static.s123-cdn-static.com/uploads/4423714/normal_6006e1b753efb.pdf
    • https://cdn.sqhk.co/sovanoniwuva/R1ijgg3/best_voice_activated_recorder_2020.pdf
    • https://cdn.sqhk.co/laruxibut/pgehiVF/52842238306.pdf
    • https://kikafizujugu.weebly.com/uploads/1/3/4/0/134012642/5334069.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/1bc4c9b8-5223-4d1f-9b11-c93560ae2476/mefix.pdf
    • http://tosaxope.rf.gd/10011931769.pdf
    • http://wepilujal.rf.gd/sawupujosasufiguferik.pdf
    • https://uploads.strikinglycdn.com/files/05d7d40a-82f5-4161-ab5a-37830a230a65/poteso.pdf
    • 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_off0000f332.bin
53c2f9c3efbf20db1ae8666b1c72061e711ef2aeeac828565da284295b8a20c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF332 5512 bytes
font_01_sfnt_off00010603.bin
e08780bc67986c9dd1213377f774f8613f40f35be7a9ad31cfeb8b8cb29c3c34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10603 10936 bytes

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