Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf268e994dccd411…

MALICIOUS

PDF

65.9 KB Created: 2020-12-16 13:49:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 7e99e408afe7e7c6561748211085bc2d SHA-1: d12eda46e06726abeacd4848b578d081ccf6eed2 SHA-256: cf268e994dccd4111a01144b8c5de8ada93e6fadc31d0680dd1c34152253d514
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 critical heuristics identifying it as a malicious redirector and a link farm. One of the primary links points to a known malicious redirector, and another leads to a PDF hosted on Weebly, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://cctraff.ru/123?utm_term=calendario+2015+mexico In PDF document text
    • https://fipamowusaki.weebly.com/uploads/1/3/4/8/134879766/99325785bc74ccb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446942/normal_5fb4e47e0b72b.pdfIn PDF document text
    • https://bigonokefexix.weebly.com/uploads/1/3/4/5/134518339/1cbdb304d4d2a2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc526639955c744b556fee0/t/5fd1cb0a071bbc68802af60c/1607584524813/weekly_lesson_plan_template_free.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5deeb1c8c74131453fc73/t/5fc5f8cd4f98375720ac9d29/1606809805818/3_the_relative_highness_or_lowness_of_a_sound_is_called.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcf9cb3fdc31513a0f6fdf/1606220236738/rurivevitiwufumomirix.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc385f1c89e1c4b8fcf14f7/t/5fcd671deb18547f4b97c400/1607296798456/u_mobile_centre_kuching.pdfIn PDF document text
    • https://s3.amazonaws.com/bufipevuril/ultimate_boot_cd_windows_7_iso.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc110906609fd0ee7923de0/t/5fce6dad80d6c02383c5f821/1607364027660/gaa_senior_football_championship_2020.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf4ef12dd96f5918e5286a/1606373105804/86822983748.pdfIn PDF document text
    • https://s3.amazonaws.com/tikoweravisixu/calculadora_casio_fx-_570ms_manual.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_off0000c40a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC40A 5332 bytes
SHA-256: 1b0d672be481be2adc476fd731ebd249a05398651028ef56b4eb8bfc3379a141
font_01_sfnt_off0000d61c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD61C 11216 bytes
SHA-256: bdcf6d40978706d7e174c4caf7a631f7235bc46c88327a476681e5ae38adee99

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