Malicious PDF — malware analysis report

Static analysis result for SHA-256 a55f34e304c7086a…

MALICIOUS

PDF

116.6 KB Created: 2020-11-27 21:13:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 4650e9f5dc4f99d83269a6c2315a2067 SHA-1: 965b31aaa6da016115f75127f9b6948e21c2f0f0 SHA-256: a55f34e304c7086a656ca96e2c98a0fa4f170714eff6b2a57f32074e551a5bb8
156 Risk Score

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://trafffi.ru/strik?utm_term=alachua+county+school+board+calendar+2020-21 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4416929/normal_5f9e7514e520d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404753/normal_5fa7a33692c8f.pdfIn PDF document text
    • https://xenexaguvu.weebly.com/uploads/1/3/4/2/134265948/mulas.pdfIn PDF document text
    • https://kilunifogewawo.weebly.com/uploads/1/3/4/4/134457757/e94d6f.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/nezanurugega/10264752211.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afc39fc2-f3c1-4087-a760-c1ee966ffb2e/gary_the_snail_plush.pdfIn PDF document text
    • https://s3.amazonaws.com/bulozor/best_bank_exam_books.pdfIn PDF document text
    • https://s3.amazonaws.com/jazuravazaguz/m_s_christmas_food_order_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8835e63b-9672-4864-9f19-19bfa7fcc59d/dowotogekajibakajasufax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14b3c926-1366-4d52-b321-28670fabccc5/herido_pero_aun_caminando.pdfIn PDF document text
    • https://s3.amazonaws.com/sojebelevenex/features_of_an_information_report_year_3.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_off00018c08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18C08 5616 bytes
SHA-256: 4d6b13e46280c2955d31022e6d33acfcc904eab84fda172405058b338a227db7
font_01_sfnt_off00019f23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19F23 11208 bytes
SHA-256: 59d52770ddbbbec5b7020152126afb3ffddd7df1c92a288cb8c68751a32f5e51