Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbb3081c7fe088e0…

MALICIOUS

PDF

76.2 KB Created: 2021-03-20 06:00:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cdb284f366a17a53eb1c199e52878c36 SHA-1: 7e8a2c0d7a153066c3e112eb0b005192b73f8a24 SHA-256: fbb3081c7fe088e0cdf4a2d471442375026c7fcf7d0424104dcc636e251d2037
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a primary suspicious URL pointing to 'vilenefex.ru'. Heuristics indicate a PDF link farm and ClamAV detection as 'Pdf.Phishing.Trojan'. The ML classifier also flagged it with high confidence. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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=how+to+set+casio+wave+ceptor+watch
    • http://zilijakal.iblogger.org/vebutosis.pdf
    • http://verifybadgesbusiness.com/xelenanilajekorndz3.pdf
    • http://bandalet.club/49215792992eirou.pdf
    • https://turarizamagux.weebly.com/uploads/1/3/1/4/131453837/8200659.pdf
    • http://raisinsapp.club/how_long_does_it_take_to_learn_aramaicm5pwk.pdf
    • http://xbet1.fun/do_bosch_jigsaw_blades_fit_black_and_deckerr6uiw.pdf
    • http://tiktokcopyrighthelpteam.com/convert_byte_array_to_base64_string_java_754lrd.pdf
    • https://kagukemo.weebly.com/uploads/1/3/4/8/134884413/bejetil-bonipemumivovoj-legowipaxaxeg-dunubim.pdf
    • http://scarcebook.com/elm327_mini_manualj6nnd.pdf
    • http://pogadai.xyz/free_tableau_training_for_veteransocavc.pdf
    • http://baltika-trans.com/78328529356qn2v5.pdf
    • https://raromimuzu.weebly.com/uploads/1/3/0/8/130874361/fb0c735f53b90ef.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/2692c82c-3cee-4e6e-964b-09e980dde207/logitech_harmony_880_advanced_universal_remote_control_manual.pdf
    • https://s3.amazonaws.com/wolawatin/fuxomukowalumob.pdf
    • https://uploads.strikinglycdn.com/files/cddb9112-025c-4359-91d1-2279bc15e562/vapifizekuj.pdf
    • https://s3.amazonaws.com/selivuvumepaveb/wudojolezef.pdf
    • https://uploads.strikinglycdn.com/files/d2fe2cd5-a946-4592-b43a-57d97c6e9228/is_lattice_energy_usually_endothermic_or_exothermic.pdf
    • https://s3.amazonaws.com/mojivikapeti/les_mis_characters_ranked.pdf
    • https://uploads.strikinglycdn.com/files/42299456-b383-424c-8d6e-9b4f752408a5/ruzedapidezapajorezotoxa.pdf
    • https://uploads.strikinglycdn.com/files/eed9ed3f-d9bc-4f76-b1ea-11267275508e/what_would_demonstrate_the_differences_between_niche_and_habitat.pdf
    • http://jibutabupax.rf.gd/computer_books_download_free.pdf
    • https://s3.amazonaws.com/pexodugosa/usb_burning_tool_v2._1._6.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_off0000ee6d.bin
4c711592cbfc073b76356f18a0f61b8e96fc3e5302f75671cc040f96531cfddc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6D 5104 bytes
font_01_sfnt_off0000ffde.bin
8c6ccc0cb9e1c572ed0dadd6a20eb115bc8a8e00e4581100b7c38dcf8362a6c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDE 10344 bytes

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