Malicious PDF — malware analysis report

Static analysis result for SHA-256 133c536874a23b48…

MALICIOUS

PDF

80.3 KB Created: 2021-01-02 20:08:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 0140ee8a127444c9fc2ad758434999b7 SHA-1: e87919a7f896dea5e741d5d84ddad8cc3e8f0e40 SHA-256: 133c536874a23b4800bbaeb128c79d5126f2b54ae061a6044eb419ba3a2aa2c3
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, and is flagged by ML classifiers and ClamAV as malicious phishing content. The document body, though heavily obfuscated, appears to be related to the URL 'how to block a youtube channel on phone', suggesting a lure for phishing or scamming. The presence of numerous external PDF links indicates an attempt to direct the user to potentially malicious content hosted elsewhere.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafffi.ru/123?utm_term=how+to+block+a+youtube+channel+on+phone PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4470542/normal_5fbe9b8c9e952.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369165/normal_5f926627220f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385021/normal_5f9aebb58ecbf.pdfIn PDF document text
    • https://begaraga.weebly.com/uploads/1/3/4/6/134652864/7502221.pdfIn PDF document text
    • https://jevizaja.weebly.com/uploads/1/3/4/8/134869407/fuzevixajijuve.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465125/normal_5fbb22a57ee0f.pdfIn PDF document text
    • https://moxuvobojivoz.weebly.com/uploads/1/3/0/8/130873852/9877205.pdfIn PDF document text
    • https://xawavefite.weebly.com/uploads/1/3/4/6/134667803/cc2b86.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3e15684-ed6d-4a22-93c6-3a2028e0b6a0/directv_channels_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ab78981-37c0-4aac-9736-ac94e1d96744/27109749666.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f3c4292-b7d4-44e3-a72a-b16df836c89e/chapter_11_chemistry_study_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a9d5ff5-5ab8-4ca5-97cc-f36879ef3f1a/touchgrind_skate_2_hack_apk_ios.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_off0000ff4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF4E 5104 bytes
SHA-256: 14fc6746d886437a6d76671518c8073f54ea3f10f822937d318da9b3a5519378
font_01_sfnt_off000110c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110C7 10340 bytes
SHA-256: 625575db6e1e22c2862f0100ac5d9a6390aae13b613b7a749d97309a88b9efaa

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