Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f0ca23bef9b82f5…

MALICIOUS

PDF

88.0 KB Created: 2021-03-07 23:55:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a6915b3e3e2d9e0cf576811dd9c5ffdc SHA-1: 2d8b5ec02d191eb5d094e198a72e8aa0cb94daea SHA-256: 4f0ca23bef9b82f5a89d268c5c33298d114388be2b5db8328fa62ecdc33a3444
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with a critical heuristic identifying it as a 'PDF_SEO_LINK_FARM'. One of the primary external URIs, 'https://jumiwimov.ru/strik?utm_term=what+were+the+goals+and+actions+of+the+jacobins', is flagged as unknown reputation, suggesting a malicious intent. The ML classifier and ClamAV detection strongly indicate maliciousness, likely related to phishing or malware distribution via the linked content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://jumiwimov.ru/strik?utm_term=what+were+the+goals+and+actions+of+the+jacobins
    • http://zonerokemub.getenjoyment.net/38968833195.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/petikamov/67183485152.pdf
    • https://uploads.strikinglycdn.com/files/f6e061f8-8cf4-47da-8469-9596ee11c85a/whats_the_best_modem_for_centurylink.pdf
    • https://uploads.strikinglycdn.com/files/e933c9bc-2409-4855-92b7-c5e0c444abc7/628125819.pdf
    • https://s3.amazonaws.com/jedadokuti/70139882030.pdf
    • https://s3.amazonaws.com/jafujasiwetid/xifuzijezosixizenivipinu.pdf
    • https://s3.amazonaws.com/wovitiku/bexunaw.pdf
    • https://709e7e89-b264-4d73-b757-064736ed86f1.filesusr.com/ugd/f523c3_b3b8690724e543d19d04abd12764e0d8.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e1f13b9f-1f67-454e-b8e8-bd6c61351c2b/fefezira.pdf
    • https://b1b0174c-961c-4936-87f6-765e1132391e.filesusr.com/ugd/6cf804_f1c2c73c8e804ac1ad9be174e7e86e16.pdf?index=true
    • https://s3.amazonaws.com/setikizo/simple_song_to_play_on_acoustic_guitar.pdf
    • https://3fb740b9-71d8-4183-8edb-de11b68c0a29.filesusr.com/ugd/1fbf8b_e37e63d3b54f496486953e5a48559751.pdf?index=true
    • https://s3.amazonaws.com/tarizirefevifab/elements_of_literary_journalism_reportage.pdf
    • https://s3.amazonaws.com/desekusoxi/florida_gators_football_recruiting_bleacher_report.pdf
    • https://s3.amazonaws.com/setikizo/baretorekugig.pdf
    • https://891dfe3a-8969-4df2-b253-5ccc4ebbb7a0.filesusr.com/ugd/e66789_4591fc8c5f0b4cf1bad68f94b29f753e.pdf?index=true
    • http://vorisenunajix.myartsonline.com/burger_king_menu_south_africa.pdf
    • https://69c5641f-197a-42c1-bef1-daa502c1f1d7.filesusr.com/ugd/948cea_8f9b910334084e6ab5478522cc1d2955.pdf?index=true
    • https://s3.amazonaws.com/lumixi/verb_in_present_continuous_form.pdf
    • https://s3.amazonaws.com/kavugusepe/the_lost_spires.pdf
    • https://s3.amazonaws.com/livivuvuwugeb/qatar_airways_flight_ticket.pdf
    • https://uploads.strikinglycdn.com/files/cf6d63f0-3061-4fab-b2f1-f8f4e14a794e/what_are_the_steps_to_write_a_poem.pdf
    • https://s3.amazonaws.com/ritoma/gst_ka_full_form_english_mein.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_off00011a3f.bin
80ee280a0c4aa4235c468ec6bbbb0148479079eb630c09d78c1c66c84aa86e5a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A3F 5604 bytes
font_01_sfnt_off00012d64.bin
c64c9b91faa9c9f04ad7cb4bcc90e42369b46768dfbcd3f9d172ee8ad416cd1e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D64 10796 bytes

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