Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dfd20979d6b4934…

MALICIOUS

PDF

69.9 KB Created: 2020-11-11 18:28:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 005815729a07bfd673807bb8cbf8d746 SHA-1: 18ea5cd9192f1b59786eebd4b31d140852735c22 SHA-256: 5dfd20979d6b49342525a9351d5c7cddf0b1062f6a0daace372ce44b631e0be5
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URL that points to a domain associated with malicious activity. Although no scripts were explicitly extracted, the PDF structure and the presence of an external URI suggest it is designed to redirect users to a potentially harmful website.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=modulos+de+repeticion PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4469143/normal_5faacc2d57107.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365541/normal_5f9351e5bbc47.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365555/normal_5f87d7a1e1d55.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473053/normal_5fa664a5057df.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/mijedusovineti/libro_el_cerebrito.pdfIn PDF document text
    • https://s3.amazonaws.com/kigavanus/pilit.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/bucor_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7206cb1-07b3-4131-b358-12bd99875e43/mabipov.pdfIn PDF document text
    • https://s3.amazonaws.com/vuraradaso/50799420765.pdfIn PDF document text
    • https://s3.amazonaws.com/toliwudalamem/18615208237.pdfIn PDF document text
    • https://s3.amazonaws.com/divexikav/setarabumiwevademe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0dfdf878-b06c-4b99-a496-992849696503/86172346905.pdfIn PDF document text
    • https://s3.amazonaws.com/zobuwubedak/alter_ego_5_cahier_d_activits.pdfIn PDF document text
    • https://s3.amazonaws.com/zetituri/lokojugarirosap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7735bd69-6b4e-43db-81a1-e3e313cd7591/hermann_hesse_narcissus_and_goldmund.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27b3b653-398a-47b3-9313-6fad01279d36/vitukenozakaxe.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_off0000c681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC681 4744 bytes
SHA-256: a6d6b9d595405be72b7e9d14d85369555ab3a5c31debeba36809520207da6ff6
font_01_sfnt_off0000d6b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B3 11396 bytes
SHA-256: bbce5aa369e965f92530fa7eaf96a6ca0cbf7d43abc7d32ecf9c0efd3ecec126
font_02_sfnt_off0000fb40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB40 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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