Malicious PDF — malware analysis report

Static analysis result for SHA-256 5128663e77825633…

MALICIOUS

PDF

83.2 KB Created: 2021-01-11 09:29:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec3a8026f68ddc42d81d7c0a9b7ecba6 SHA-1: 7f869cbd62cec27124ed04cf3569944fa50f7c7c SHA-256: 5128663e778256332953c071833761a6b5a5d18d140dccdb03c9ac622d0ac5d1
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, suggesting it functions as a link farm or phishing lure. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic indicate an attempt to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafffe.ru/aws?utm_term=prolonged+jaundice+guidelines+malaysia
    • https://cdn.sqhk.co/lotazoza/hiVhgi9/egyptian_king_soccer_player.pdf
    • https://static.s123-cdn-static.com/uploads/4404730/normal_5ff69b72eaa40.pdf
    • https://static.s123-cdn-static.com/uploads/4370054/normal_5fc74594ba998.pdf
    • https://cdn.sqhk.co/wedegetuso/cjajeAA/17659693257.pdf
    • https://cdn.sqhk.co/tororukiwuri/hdigAih/bed_wars_game_download_laptop.pdf
    • https://site-1180799.mozfiles.com/files/1180799/nal_arena_football_salary.pdf
    • https://static.s123-cdn-static.com/uploads/4386363/normal_5fcb261d308a5.pdf
    • https://gumopaxegekugod.weebly.com/uploads/1/3/4/0/134018731/1293908.pdf
    • https://cdn.sqhk.co/zubavagi/ecWGhhK/ibis_paint_x_download_for_windows.pdf
    • https://site-1176996.mozfiles.com/files/1176996/ararara_khatarnak_song.pdf
    • https://cdn-cms.f-static.net/uploads/4485457/normal_5fe6b2af63e26.pdf
    • https://cdn.sqhk.co/dubagelojuwe/o6Fevgi/wolf_girl_and_black_prince_movie_cast.pdf
    • https://cdn.sqhk.co/sivefuxonix/jfme66w/3327787498.pdf
    • https://rilodogalaru.weebly.com/uploads/1/3/4/3/134398508/4dc84.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/nalifij/vigopojesuvekab.pdf
    • https://s3.amazonaws.com/jeduzizonox/mechanisms_of_evolution_worksheet_1.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_off00010789.bin
cb20c7a425bbf0350beaf21bf163a5cfd7d8803ddc7d99afbfc8aaabf5629e64
pdf-font-stream PDF embedded font (sfnt) at offset 0x10789 5440 bytes
font_01_sfnt_off000119f9.bin
b4d1afde7bf3a751664769ae2fe4e683ecbea2bfd7d4cd4d356cf1389349b363
pdf-font-stream PDF embedded font (sfnt) at offset 0x119F9 10904 bytes