Malicious PDF — malware analysis report

Static analysis result for SHA-256 a128252ac51ee1b3…

MALICIOUS

PDF

67.4 KB Created: 2021-03-21 09:58:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: de381108b320fe523bcd3de47a3d5025 SHA-1: 002162f289980f036ba26fbaeac9120d08589f02 SHA-256: a128252ac51ee1b3184a0908ec66840e9f27ac92bc3545e6d89c0ca72783f39d
96 Risk Score

Malware Insights

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

The PDF contains an embedded URL that directs users to a suspicious domain, likely for phishing purposes. Heuristic analysis and ML classification strongly indicate malicious intent, with ClamAV identifying it as a phishing trojan. The document body, though heavily obfuscated, appears to contain lure text related to 'Dexter episode guide'.

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://gimoguvi.ru/123?utm_term=dexter+episode+guide+imdb PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4497688/normal_60525f0684951.pdfIn PDF document text
    • https://cdn.sqhk.co/dejowipapoli/gKheUig/38197698016.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421476/normal_5ff3fc7fb8b3c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413563/normal_603b79879acd8.pdfIn PDF document text
    • https://cdn.sqhk.co/bokirebi/igf6jfq/film_quiz_questions_2019_uk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470399/normal_60402e267e2ac.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476751/normal_5fe1a69bc5139.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384650/normal_5ff51725ca369.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379859/normal_5fff41efcfe4f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379974/normal_601e4a174f017.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/71b1a3a4-f6c8-44f1-ab6e-385aa43598a1/31175425226.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea3d035e-f5d0-459c-9d99-d55007064864/best_stocks_for_beginners_2020_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/fejakixoweka/87534974707.pdfIn PDF document text
    • https://s3.amazonaws.com/xakusineba/piwapadutu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/101c0c80-fb4c-4b43-955c-c6a07e0c5133/pusapemorikokajowixo.pdfIn PDF document text
    • https://s3.amazonaws.com/tobobowu/25083349806.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bf833b3-30da-4266-ae54-f3d6dd9f89e9/brother_xl2600i_standard_settings.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_off0000cb24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB24 5244 bytes
SHA-256: 17cf283342bfbc7271ac5945e73e366593d5f8e7ae62330ce64f286ff013357e
font_01_sfnt_off0000dcec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCEC 10560 bytes
SHA-256: 04d0163cc8fce07ba69d515b2c77a5ec5540be569ea50b5f93a34ea8e0ce7143

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