Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1a263f9bae96c00…

MALICIOUS

PDF

60.0 KB Created: 2020-11-17 02:35:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: ddb76e49bcb4d3dafac4e2a59e542663 SHA-1: 5c0b824de8c6caaebaa87b8257a1c10801f47e3a SHA-256: f1a263f9bae96c001b63fb8386d76b3b24d7c0f178e6cb3ac94d7ab7d592a5a3
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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://traffset.ru/strik?utm_term=callister+ciencia+dos+materiais+download PDF link annotation
    • https://nazizuvadonilu.weebly.com/uploads/1/3/4/5/134590702/titav-denisanusu-dinano-waxiwimopubu.pdfIn PDF document text
    • https://bujozimadepaxed.weebly.com/uploads/1/3/4/6/134615651/letokojorefu.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/rekibedafowow/psn_card_free_no_survey.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/612e7b7a-c032-4347-98da-3bddb591b201/67458352661.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/sybex_checkpoint_ccsa_study_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29400cef-5f27-451f-af5c-293c816e26e8/zobizedowakobef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7129dcc1-4f31-406c-bf22-52121ad3a18b/60469836624.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e887db53-cee2-47ef-8e90-dd4c23a86e74/caliper_test_question_63_answer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92dd8f8a-3160-418c-b698-51c362cb23b8/hyperbole_worksheets_images.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eca84f9e-230b-48c2-8d2f-3e2912a7de4f/4711296484.pdfIn PDF document text
    • https://s3.amazonaws.com/levumoduf/pikon.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_off0000ad44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD44 5080 bytes
SHA-256: 3191111e28401abfbaf1bb809c0a36e77e5b40cd296b7a9a4a126547af202d46
font_01_sfnt_off0000be7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE7C 11164 bytes
SHA-256: b445985732b23bce04c906ad69b8020ef57165f005fb7a1cfdb44c9362e74e54

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