Malicious PDF — malware analysis report

Static analysis result for SHA-256 834cb6b52e52156b…

MALICIOUS

PDF

72.6 KB Created: 2021-03-19 19:54:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 0d0b7ee03cd9f689139ef61ffdd01df6 SHA-1: f44d30c5e6c66775dfaf45ea414fdfe478335bc5 SHA-256: 834cb6b52e52156ba0b1d236e4247c5729422b1ad1c16fb4211526dff22a2482
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified as a 'PDF_SEO_LINK_FARM', directing users to various websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content.

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 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.
  • 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://kuzutuzo.ru/award?keyword=hacer+calentador+solar+casero+pdf PDF link annotation
    • https://zotapuzuvekef.weebly.com/uploads/1/3/4/3/134323554/6528283.pdfIn PDF document text
    • http://sokegex.mywebcommunity.org/altitude_of_a_triangle_worksheet.pdfIn PDF document text
    • https://lefexaro.weebly.com/uploads/1/3/5/3/135324439/bodan-paregameru-kirugozas.pdfIn PDF document text
    • http://masevetito.22web.org/catia_v5_sketcher_workbench.pdfIn PDF document text
    • https://sotevujek.weebly.com/uploads/1/3/4/0/134012487/xelitoxu-vobumelit-dugumo.pdfIn PDF document text
    • http://juwaniwabi.medianewsonline.com/libro_rey_arturo_ylos_caballeros_de_la_mesa_redonda.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zijivevip/concept_map_nervous_system_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/mulerux/how_to_make_homemade_ice_cream_in_a_blender.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aab4d258-b1e4-4842-aea7-23279786f9f6/dopip.pdfIn PDF document text
    • http://purewowesajumu.myartsonline.com/54238915312.pdfIn PDF document text
    • https://s3.amazonaws.com/vokeri/31730724245.pdfIn PDF document text
    • http://wovovaj.rf.gd/dupefiwokar.pdfIn PDF document text
    • https://s3.amazonaws.com/bisiku/24732612846.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7e5df48-3584-45f1-a870-d2ffa29e1eb0/digital_logic_design_software_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/dikomavomem/commercial_kitchen_rental_agreement_template.pdfIn PDF document text
    • http://kufekisawisewo.onlinewebshop.net/20840068459.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/965ed2ed-539c-470e-80e2-df64c380fa6e/zabego.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_off0000dd54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD54 5112 bytes
SHA-256: c9dfffaa684d09e5800c39bdf925a7b3dd0188a54f237314acc119d6d9266917
font_01_sfnt_off0000eec4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC4 12056 bytes
SHA-256: 935d329ab039448672efab9cd7d10d644aaa7acd4711dca4dfdf6f5c935ea635

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