Malicious PDF — malware analysis report

Static analysis result for SHA-256 426fb8dea01c223d…

MALICIOUS

PDF

84.2 KB Created: 2020-12-17 18:06:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: bbdd4eecda8e53cea34df37de25f3dfb SHA-1: a1b278d20da024dec968171770b9aba95368c791 SHA-256: 426fb8dea01c223d98fce76e86c56dfdc553b69708489dcb30af1c30c1428dee
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or a link farm designed to generate traffic. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://gettraff.ru/strik?utm_term=leaf+stone+no+pokemon+emerald In PDF document text
    • https://lozukiwilef.weebly.com/uploads/1/3/4/6/134644014/6773461.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421640/normal_5f97d0ba845ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488566/normal_5fba0999781bb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454304/normal_5fcc75c855dea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461525/normal_5fb3b6e592819.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/lusegokaves/melanie_laurent_piano_sheet_music.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc71060fa9ecc39789d5d35/t/5fcb3a821415195da0824f89/1607154307514/wheel_of_fortune_video_games.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc64f06116eb00e3c70da9e/t/5fc82ca7217b3604edd2727f/1606954152632/sun_tzu_art_of_war_quotes_for_business.pdfIn PDF document text
    • https://s3.amazonaws.com/tokafanawa/i_serve_the_soviet_union_template.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/and_gate_project_class_12.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc4e5cef7cf8c75404468c7/t/5fc5c05b3c02f22b9dd3c08d/1606795358668/21974859526.pdfIn PDF document text
    • https://s3.amazonaws.com/vibuvomomuv/cribriform_plate_function_anatomy.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DA 3620 bytes
SHA-256: 17de5dfac414c87823135f09b9e935df37d7b21441f22ced088e3b4628da40f4
font_01_sfnt_off0000f4e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E0 5192 bytes
SHA-256: 7bd5a1ab7c6da1e2361910c8410b75a55d76f89b1cfc940d8791178408666e41
font_02_sfnt_off0001067f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1067F 11536 bytes
SHA-256: 9161a0ef1db651abb9da1ae4c53a755b78c8a60256384866c546c290cf614f12
font_03_sfnt_off00012c9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C9C 16228 bytes
SHA-256: 20a5df4607361eba960e855f4ffa18cbda9c95112a61f9bea8b182556947834f

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