Malicious PDF — malware analysis report

Static analysis result for SHA-256 33a9ff40eb4e467d…

MALICIOUS

PDF

63.9 KB Created: 2021-01-16 10:35:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 3d36c7dfeacf0e4f181c964d9a12af7f SHA-1: 74bb230161a7ad4b9f51d06409e7975fd82f0cbc SHA-256: 33a9ff40eb4e467dbd4667355ebdfe8a50d4cd712208436540c604460b3256cb
156 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a link farm, suggesting it is designed to host numerous external links. One of these links, 'https://trafffe.ru/aws?utm_term=wrong+turn+6+cast+full+movie', is presented in a way that mimics a search result, likely to trick users into clicking it. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

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://trafffe.ru/aws?utm_term=wrong+turn+6+cast+full+movie PDF link annotation
    • https://cdn.sqhk.co/girolivudafo/wQjfjfw/happy_birthday_cake_topper_svg.pdfIn PDF document text
    • https://site-1179889.mozfiles.com/files/1179889/basara_temple_information_in_telugu.pdfIn PDF document text
    • https://bimenejujuw.weebly.com/uploads/1/3/4/5/134592033/8250558.pdfIn PDF document text
    • https://cdn.sqhk.co/bugininaxi/aIjaNzS/metuwak.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455197/normal_5fdd383da6890.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/dejolavubukugeb/excel_spreadsheet_loan_amortization_schedule.pdfIn PDF document text
    • https://s3.amazonaws.com/xufaxoferugod/designers_website_free_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/mivokozibu/gujanozodudowamugisawav.pdfIn PDF document text
    • https://s3.amazonaws.com/nalifij/32412306942.pdfIn PDF document text
    • https://s3.amazonaws.com/bajapovogam/10714296590.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_off0000bc1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC1D 5428 bytes
SHA-256: 38d12d33ad5955fcbe346d1abff55f7c5698f9f3626c9838ffacb97ce49c7e0a
font_01_sfnt_off0000ce98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE98 10848 bytes
SHA-256: ec351cbfe71edb7bc7d9cb927d7466974bd16cb9d6b7c9134d1268b29129aa3f

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