Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ec6f2a8b8ad4e9a…

MALICIOUS

PDF

92.9 KB Created: 2021-03-03 13:46:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: acb94c4dc0ea55fc9dd5ce68d2c123dc SHA-1: e824ada6c362b91c192e9f07c56cf42b150dad47 SHA-256: 0ec6f2a8b8ad4e9a8a5604bc8a4d5d4399620f812b6697021b11e1982bf73e36
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. The primary URL, https://jumiwimov.ru/award?keyword=calculus+problems+examples, suggests a lure to attract users through search engine optimization tactics. The presence of numerous PDF links, including those hosted on cdn.sqhk.co, indicates a potential distribution mechanism for further malicious content or phishing attempts. ClamAV also detected this file as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9369

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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/award?keyword=calculus+problems+examples PDF link annotation
    • https://cdn.sqhk.co/boxokozofe/igUjjgf/81242428501.pdfIn PDF document text
    • https://cdn.sqhk.co/nadipozow/atgd4TV/amazing_adventure_wipe_stunt_run_3d.pdfIn PDF document text
    • https://wekupadafar.weebly.com/uploads/1/3/5/3/135315244/7690641.pdfIn PDF document text
    • https://cdn.sqhk.co/vetelojid/jtuYgd8/79403865219.pdfIn PDF document text
    • https://cdn.sqhk.co/matikefateri/bjhhiic/b_o_o_s_t_post_meaning.pdfIn PDF document text
    • http://xugilerasifoveg.22web.org/windows_server_2012_r2_cumulative_update_december_2020.pdfIn PDF document text
    • http://golobupovi.22web.org/lilezogekegolu.pdfIn PDF document text
    • https://cdn.sqhk.co/foletesubuf/dNsji2F/hobby_lobby_locations_in_michigan.pdfIn PDF document text
    • https://cdn.sqhk.co/nixibaraje/icWRYig/19941918267.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454303/normal_6031f1fe4e659.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447487/normal_602ca2e1b5172.pdfIn PDF document text
    • https://cdn.sqhk.co/jurugaguvedu/WiejiwV/jafunosaradutep.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409248/normal_6027a7c770c57.pdfIn PDF document text
    • https://cdn.sqhk.co/revujinarewu/hOjgegc/tubasijotizevukowazez.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368760/normal_6037e7647a9dc.pdfIn PDF document text
    • https://cdn.sqhk.co/zopizote/jhTkjbS/papa_s_cupcakeria_game_play_free_online.pdfIn PDF document text
    • https://cdn.sqhk.co/kizofapekeku/pjcfgil/wood_turning_lathe_for_sale_cape_town.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wetafemef.epizy.com/aida64_pc_free.pdfIn PDF document text
    • http://xupiwepe.epizy.com/76037443734.pdfIn 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_off00013d5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D5F 5192 bytes
SHA-256: bc946089674109c6d0a0ee8493b011d46d0ff56efb1ca36d08ffd2a6e525db15
font_01_sfnt_off00014ee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EE9 10412 bytes
SHA-256: b88b6946de4ca2bbc40ac48f4c5f34bf4105df162ac47c2a52ca267896db02b2

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