Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b117596df358cca…

MALICIOUS

PDF

65.2 KB Created: 2020-11-20 09:36:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: a0b7e82e24ebea5233309090914b574e SHA-1: d7b51a08b9c8a3b26f1007bfa69bef804f6501d5 SHA-256: 3b117596df358cca4ed55d0a1f9fd4a452ae9b65a6a318849c6ed807f76a3179
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URI pointing to a suspicious domain, which is likely part of a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The document body, though heavily obfuscated, appears to be a lure for '3d chess free for windows 8'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafffe.ru/aws?utm_term=3d+chess+free++for+windows+8 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4380209/normal_5fb5d3a679b08.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415950/normal_5f9a444f5583b.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/09a2902a-6f88-4476-abd9-8533720fff04/zatisazekewetuwonebeje.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxenipup/unit_3_geography_challenge_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c198518-9fc5-4316-8cb3-1bd2e33b44d5/vakowozonalakazezebabazej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33aa2894-c059-4850-812a-c6adfc290104/mulog.pdfIn PDF document text
    • https://s3.amazonaws.com/tigovatolis/google_sheets_desktop_site.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8afb0b3a-0d66-4fb6-ae89-981123738b93/goviwe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ec2e8f0-3142-4618-b6a2-7b40bf2d2b24/47220417296.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbb025ad-3c74-46e5-8eda-61daae509358/doduvigusalubutusozotofo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3710f844-3937-4214-9acf-dbed08d4628a/sample_letter_to_remove_board_member.pdfIn PDF document text
    • https://s3.amazonaws.com/mibiwivanetuj/30284587794.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_off0000c289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC289 5224 bytes
SHA-256: ef65522c96aea9928ccff70c5b7569c214d2f2b99d12c27472e2d76b52c347d3
font_01_sfnt_off0000d461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD461 10448 bytes
SHA-256: ded9ee38020386a9dd58e8e4de1dfbc9508d40cd4fa1eec0cf97bc5cca84f80c