Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ca3a8c9cf856ca7…

MALICIOUS

PDF

120.0 KB Created: 2021-03-14 02:35:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: d5596ac3aad96eddccc3606019538d26 SHA-1: a06756d8bba0784e7f82b48cf6d9b1e8ae0cc9dc SHA-256: 2ca3a8c9cf856ca735644284895b1b6ffe6da06802b15479248801a228043624
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are disguised as document titles, indicating a link farm or SEO poisoning attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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.
  • 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://ponafet.ru/strik?utm_term=wonders+grammar+workbook+grade+4 PDF link annotation
    • https://cdn.sqhk.co/guvevifowo/ggijigf/rumble_in_the_bronx_blu_ray_uncut.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404105/normal_5fc76ec5ce168.pdfIn PDF document text
    • https://cdn.sqhk.co/ravuviwidi/iiijjfh/zugam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368240/normal_6016936420b1e.pdfIn PDF document text
    • https://cdn.sqhk.co/fumamimed/ihjDjfP/shark_eating_fish_gif.pdfIn PDF document text
    • https://gawakugoful.weebly.com/uploads/1/3/4/7/134757428/tukowe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382413/normal_5ffe41ea17232.pdfIn PDF document text
    • https://masezinonorokun.weebly.com/uploads/1/3/4/6/134685416/7122368.pdfIn PDF document text
    • https://cdn.sqhk.co/zepinima/2hiTCVX/the_legacy_golf_club_henderson_nv_89074.pdfIn PDF document text
    • https://cdn.sqhk.co/niripakexad/hahchaj/alan_walker_faded_instrumental_song_download_djjohal.pdfIn PDF document text
    • https://cdn.sqhk.co/filodomazora/cjajhja/toveke.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379476/normal_6031c23c70291.pdfIn PDF document text
    • https://cdn.sqhk.co/xorilulog/jy8hiRv/27541562308.pdfIn PDF document text
    • https://cdn.sqhk.co/jukowejazus/hbcsigj/interstellar_black_hole_rendering_time.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484999/normal_603f93283ce82.pdfIn PDF document text
    • https://cdn.sqhk.co/numiwuzuwix/licB8gg/91711542841.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jodabiladezot/jatukereberemaxesekogapes.pdfIn PDF document text
    • https://s3.amazonaws.com/kukupunopedon/how_to_reset_a_braun_ear_thermometer.pdfIn PDF document text
    • https://s3.amazonaws.com/gedexim/gastric_intestinal_metaplasia_guidelines_bsg.pdfIn PDF document text
    • https://s3.amazonaws.com/wudibirewuduto/ponasovizetujisixusovom.pdfIn PDF document text
    • https://s3.amazonaws.com/falufusu/17400314277.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001945c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1945C 5512 bytes
SHA-256: d4d51efb6d8c71bf5d09174010815ff2f7444551d3036e3574de79691fe2fc9b
font_01_sfnt_off0001a72e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A72E 13064 bytes
SHA-256: 10f73f28998d345b709127e9eddff962cf2db85044bfec195969bff993f1ac34

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