Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed04cc0c497852c7…

MALICIOUS

PDF

73.5 KB Created: 2021-05-18 23:33:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e08754f0f1190026843ad55ceb0a4495 SHA-1: 0f26e827be2f5bf9fddeef5a00019fdb1c525718 SHA-256: ed04cc0c497852c7751668387141f50172d6f44639e87110092e05c4dd856d8e
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document, likely intended to redirect users to malicious sites for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/strik?utm_term=exercices+de+maths+3eme+fonctions
    • https://putesoborufo.weebly.com/uploads/1/3/0/8/130814126/godixe.pdf
    • https://static.s123-cdn-static.com/uploads/4472760/normal_5ffac66bc0e99.pdf
    • https://negazebofukiwan.weebly.com/uploads/1/3/5/3/135318678/8368478.pdf
    • https://tevirilozarenov.weebly.com/uploads/1/3/2/6/132695732/jujufikaloteg-xajiponarapik-linaweribi-medawozabol.pdf
    • https://cdn-cms.f-static.net/uploads/4411932/normal_603a70c420ed4.pdf
    • https://cdn-cms.f-static.net/uploads/4489717/normal_603439ccabd46.pdf
    • https://zeteleginogegop.weebly.com/uploads/1/3/4/5/134526156/sonarozoxejetejarem.pdf
    • https://tumozoredupoki.weebly.com/uploads/1/3/0/9/130969837/banel.pdf
    • https://jaxemojemilela.weebly.com/uploads/1/3/4/6/134622921/jolakatitubisupibo.pdf
    • https://pitamiled.weebly.com/uploads/1/3/4/0/134098016/46aa7afbb60.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://bomumude.epizy.com/ms_word_business_card_template.pdf
    • https://uploads.strikinglycdn.com/files/cddd9382-8739-4deb-be14-83a4558ff2ed/epson_perfection_v550_photo_color_scanner.pdf
    • https://uploads.strikinglycdn.com/files/0e101cb3-ab3a-4eee-9de0-9e45b5090594/95752027938.pdf
    • http://pevuzimoba.rf.gd/free_powerpoint_templates_ppt.pdf
    • https://uploads.strikinglycdn.com/files/95238887-788c-4a56-9fa9-c7a560cc50d0/how_to_make_an_emp_jammer_for_slot_machines.pdf
    • https://uploads.strikinglycdn.com/files/afcb2a1c-5c01-4b7c-9c42-a8616ad24efd/the_gangster_heirs_book_2.pdf
    • https://s3.amazonaws.com/wixanarer/69342709649.pdf
    • https://s3.amazonaws.com/xiwevitox/wobejew.pdf
    • https://uploads.strikinglycdn.com/files/fc4265b7-a12f-4311-a97d-21d6d6247cdb/guluwukiguxasiwofek.pdf
    • https://s3.amazonaws.com/fuwawibu/39293137342.pdf
    • http://rovututuxopi.epizy.com/barcode_generator_freeware.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_off0000df1e.bin
794f1e45b5c5eb74870d393405c7831d2547777d8bafa4e15f362b969a1e6711		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1E 5420 bytes
font_01_sfnt_off0000f168.bin
18fcd5a4926516069fb749da33235d741923c5337d172074fec86faf0f4a5cf6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF168 11564 bytes

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