Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c0d74915992c49e…

MALICIOUS

PDF

71.7 KB Created: 2020-11-28 04:40:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: dfcbbed4f4ce19c55560ccdfcd329a88 SHA-1: d8a9636716c2a9c65a854ec02408ee32aa372217 SHA-256: 6c0d74915992c49ec54ef29501e316f47be0f19beb803d0eaf5bbaddfd1f27e2
96 Risk Score

Malware Insights

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

The file is a PDF containing an embedded URL that points to a suspicious domain, identified by ClamAV as a phishing trojan. The ML classifier also strongly indicated maliciousness. While no scripts were directly extracted, the PDF structure and the presence of an external URI suggest an attempt to redirect the user to a malicious site, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=haru+fruits+basket+age PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4375889/normal_5fc0ae5375e7c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378619/normal_5f8c4c1574048.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465398/normal_5fbb4dbd1f89f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366371/normal_5fb9688124a85.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/nafoxuda/business_communication_letter_writing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92f87bd3-0895-4ffd-a261-75b83c7c467a/31988561075.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/lexifogogisowolotiputo.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxenipup/modelling_vs_modeling.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73e881ee-357c-4bc7-a66e-088cd4ec8c18/zosakopogokodeguwiseseres.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7c46037-09aa-4b82-9450-d2cf32402424/37044943392.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d022.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD022 4148 bytes
SHA-256: 5f253afa7fc7ee3d84a1d5f5274ae90f5a734a7b63017e38713f721f394f537e
font_01_sfnt_off0000debd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBD 5068 bytes
SHA-256: e6bdb7647864d1a848c50b97eff427697cb5af9e83a6d4bd3afa6c95067d229c
font_02_sfnt_off0000f010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF010 9924 bytes
SHA-256: 470a7ce54deb71e07130b7223db9d9b11fd353c5b3ec76bb2501198b10245d00