Malicious PDF — malware analysis report

Static analysis result for SHA-256 284e5fbf38f3fabb…

MALICIOUS

PDF

65.5 KB Created: 2020-11-18 03:29:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: a417bb21c4dc4ed8333aeee353610e47 SHA-1: 1894f9c7212851da0b44ffa2af776abb0de95ba1 SHA-256: 284e5fbf38f3fabbaee57acf0a038d37067d24fbc4f9b089a96c034f66de8fa0
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many of which point to PDF files, suggesting a link farm or redirection mechanism. The primary URL, https://trafffi.ru/123?utm_term=transitive+and+intransitive+verbs+worksheets+class+5, is likely used to redirect the user to a phishing or malware distribution site. No scripts were extracted, but the PDF structure and numerous external links strongly suggest a phishing or content-luring attack.

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
  • 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=transitive+and+intransitive+verbs+worksheets+class+5 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4492245/normal_5fae4f851b199.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385011/normal_5f93ca327dbc8.pdfIn PDF document text
    • https://bujupovira.weebly.com/uploads/1/3/4/4/134472582/9212893.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377381/normal_5f8e7917c83ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381536/normal_5fb25d2827a26.pdfIn PDF document text
    • https://nalabusapigo.weebly.com/uploads/1/3/2/7/132740218/mefunam.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/36b7c840-8709-47f0-90f9-fdb8ad096cac/50081403805.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc37cdf3-dad9-4e97-a81d-54e7eb77562e/two_way_tables_and_relative_frequenc.pdfIn PDF document text
    • https://s3.amazonaws.com/woxotopapozokev/relion_thermometer_low_battery_indicator.pdfIn PDF document text
    • https://s3.amazonaws.com/zupenafud/66155168652.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bc76642-7088-413c-883d-7c886400e8d7/kusubugulumoge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81c9ed5a-fdf4-445a-9716-c88dcf581c40/bovegujigagekizi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f417c49-6a9f-429d-828f-728e5f32ba00/pudoneripejiwubukikinir.pdfIn PDF document text
    • https://s3.amazonaws.com/lovetijif/62673623336.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_off0000c321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC321 5456 bytes
SHA-256: ca9c0c4e47047de8d068c856622084695e2b2911374c612f122f728c024c4e0e
font_01_sfnt_off0000d5c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C0 10324 bytes
SHA-256: 8646f241b881fac0aab382354eb83dcaac4e558877c3f8dc66e9e28c2e0ead0e

Open this report in the interactive analyzer, or submit your own file for analysis.