Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdc078ce365eee6f…

MALICIOUS

PDF

76.9 KB Created: 2021-03-11 23:29:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 0ab3eae9e0a958a95ef013ace2c61e9b SHA-1: 64f19a36b4ebb843e962e12732b49e21dd57a47a SHA-256: bdc078ce365eee6fe2072fc38550214063b1dd937acd9a6d82e32a01630940cf
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. One prominent URL, 'https://vilenefex.ru/strik?utm_term=derren+brown+tricks+of+the+mind+audiobook', is presented in a way that mimics search results, likely to trick users into visiting potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=derren+brown+tricks+of+the+mind+audiobook PDF link annotation
    • https://walagewujiw.weebly.com/uploads/1/3/0/9/130968979/9683320.pdfIn PDF document text
    • https://remogomati.weebly.com/uploads/1/3/4/7/134748537/kuketitules_dexapobel_rakabetade_kokox.pdfIn PDF document text
    • http://dafagaketa.sportsontheweb.net/nojoputedisuveve.pdfIn PDF document text
    • http://wixujikubipom.mygamesonline.org/40405000208.pdfIn PDF document text
    • https://cdn.sqhk.co/lonuxonemor/gdJ8eib/xawawagadupedowifa.pdfIn PDF document text
    • https://cdn.sqhk.co/vozaxodep/gebLSif/2__6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://74269c25-1731-4359-90d4-804f54ef9c1c.filesusr.com/ugd/b5973a_24e8d3361b264aa29a63324359c164bd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/891631db-3f8a-4fcb-bd42-2d348c480ac1/el_conocimiento_silencioso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43540597-f9af-4384-b09f-100872b05920/the_adventures_of_huckleberry_finn_sparknotes_chapter_4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c57c69b3-9f8a-49f7-a04f-3f8a13f0f036/darren_hardy_sunday_planner.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f45615f6-0a71-4737-8201-b9f1c213edb9/plantronics_wireless_headphones_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5726f3a5-da20-4fc3-b9fe-d117e6b06fe9/best_online_crossfit_training.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04752be2-f179-49e3-8f01-3c251ad81aac/is_has_a_singular_or_plural_verb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48b7b83e-8039-41e7-bc70-874c657e7681/how_to_do_bibliography_in_apa_format.pdfIn PDF document text
    • http://duribolatajofa.atwebpages.com/i_am_discourse_st_germain_1-33_complete.pdfIn PDF document text
    • https://5c839259-519f-4cee-a1a2-6639d654070b.filesusr.com/ugd/140efa_7251b4a2d57540678eccd5c7686fc1a4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/60356617-b818-43be-9991-42a53e21b945/jenuwojipexevilijedex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3b01260-5b30-4d24-9d35-0eedab0b8d14/como_son_los_sintomas_de_la_neuralgia.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D3 5408 bytes
SHA-256: 9c97e12861554d71a2379d4a160771cb06a835ae77dd7afb73fc66c7e185638b
font_01_sfnt_off0000f31e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31E 10828 bytes
SHA-256: 3a8cab89b225c363364729143aa9eb91bac573ece958f548e81de4e7471ec54b
font_02_sfnt_off000117bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117BD 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361