Malicious PDF — malware analysis report

Static analysis result for SHA-256 961ed5738c94cfbb…

MALICIOUS

PDF

79.6 KB Created: 2021-03-17 13:42:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2faedfaa348177cc8d57470cc55a80bd SHA-1: 77afb1e7f095ced38ac096bd4466982a7f76cd2b SHA-256: 961ed5738c94cfbbdb5de9e0e05be651e0d711e4f601fc09c5992d5e9029dc83
156 Risk Score

Malware Insights

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

The file is identified as malicious by multiple heuristics, including ClamAV and an ML classifier, and contains a large number of external links, suggesting a link farm or phishing lure. The presence of external URIs and a PDF link farm heuristic indicates an attempt to redirect users to potentially malicious websites. The PDF structure and embedded content are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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
  • 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://ponafet.ru/award?keyword=asset+classes+and+financial+instruments+pdf
    • https://cdn.sqhk.co/zepaginu/gdgidjb/vugadesekuleful.pdf
    • https://cdn.sqhk.co/wuzufoxo/DZfzifC/department_of_history_and_art_history.pdf
    • http://hocostyle.ru/xaponiwadepavipujuxaguzubbxzt.pdf
    • http://idealica-official-it.website/economia_del_modo_de_produccion_feudal1ei8h.pdf
    • https://danodukuwen.weebly.com/uploads/1/3/1/6/131637043/9b4d2f7995dbbb.pdf
    • https://cdn.sqhk.co/rigedaveva/aichdgh/vmware_low_level_design_template.pdf
    • http://glasshookahcatering.com/how_to_connect_afterglow_controller_to_xbox_oneflhaw.pdf
    • http://fovuvizoge.22web.org/2002_audi_s4_wagon_for_sale.pdf
    • https://wazumiwu.weebly.com/uploads/1/3/6/0/136038811/lurid_xejok.pdf
    • http://vawenujorukipep.22web.org/gukajarovon.pdf
    • http://rocketdocs.us/music_artist_profile_samplex6tkg.pdf
    • https://cdn.sqhk.co/vigamodijek/jjYTalw/pexuto.pdf
    • http://masalev.ru/laxega8dt1h.pdf
    • https://cdn.sqhk.co/fafojipedul/hb0IHig/student_class_schedule_template.pdf
    • http://vuzideko.iblogger.org/23261594767.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://josuguremim.epizy.com/12453033113.pdf
    • https://uploads.strikinglycdn.com/files/9f1d68fc-60cc-4499-9b9b-42014a5fe08d/how_to_play_mini_dv_tapes.pdf
    • https://uploads.strikinglycdn.com/files/66ac88ff-2988-4d12-aa1e-9f1e537db5bd/nokagudufores.pdf
    • https://uploads.strikinglycdn.com/files/39f83f2c-63fa-44ec-ba21-a9b324f45a3a/xovafi.pdf
    • https://uploads.strikinglycdn.com/files/f9d06d5c-a54c-4821-be0e-986e4ba40ae7/80400327329.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_off0000f5c0.bin
54731fdc5100f93216032fc15f3c6afc3aedc00bd0ffaf462c865fb55582508e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C0 5288 bytes
font_01_sfnt_off000107ac.bin
961e6204eb240eaeec77667f020ed6ae82d30b326d1f723b72cef9c7861a67f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107AC 11772 bytes

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