Malicious PDF — malware analysis report

Static analysis result for SHA-256 263d6d8d3323db3d…

MALICIOUS

PDF

63.9 KB Created: 2020-12-17 12:15:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 92adb9dcd4e04bb8a01afcc0bfacd057 SHA-1: 73a67ba9350b5a1bc1b78b4e0391482cc30c51b6 SHA-256: 263d6d8d3323db3db5e3a49fd6f535cc328a3e7c92d8449dab03382416c64c6d
96 Risk Score

Malware Insights

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

The file is identified as malicious by a ClamAV detection and an ML classifier. It contains an embedded URL pointing to 'trafffe.ru', which is likely used to deliver a malicious payload or conduct phishing. The document body, though heavily obfuscated, suggests a lure related to educational content ('compare and order rational numbers worksheet'). No scripts were extracted, but the PDF structure and embedded URI heuristic indicate the presence of external links.

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://trafffe.ru/123?utm_term=compare+and+order+rational+numbers+worksheet
    • https://cdn-cms.f-static.net/uploads/4369633/normal_5f929c4eaf19d.pdf
    • https://zekuwatifakaxi.weebly.com/uploads/1/3/2/8/132815855/tutewojozamewe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/ed8f2c53-477a-49d1-944c-9ddb7be7f6dc/tibefulurijowugojutaw.pdf
    • https://s3.amazonaws.com/widuxade/swing_time_zadie_smith_summary.pdf
    • https://uploads.strikinglycdn.com/files/a4c5992e-8dc7-439b-8151-43931ad06f65/wevigotagifewip.pdf
    • https://uploads.strikinglycdn.com/files/c4afb53f-afe3-4cfb-90da-b40f8786587a/civilization_5_community_balance_mod.pdf
    • https://uploads.strikinglycdn.com/files/ac3d7e8b-b0b6-4761-805a-f2be27de1bd4/revovusifasavodi.pdf
    • https://uploads.strikinglycdn.com/files/22680539-df0b-44e1-bdcd-f9abca62b9b4/satibiwafolofagof.pdf
    • https://uploads.strikinglycdn.com/files/c75916e7-8575-4843-aeae-44f5545be5c3/62949038001.pdf
    • https://s3.amazonaws.com/jinotugiwomo/meme_compilation_trombone_sheet_music.pdf
    • https://s3.amazonaws.com/nigimul/sirona_s_car_seat.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bb12.bin
1de894f84697ada0baa993eb17062eaec9085d48c5fdc0d017b0cc1578904e68		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBB12 5400 bytes
font_01_sfnt_off0000cd3f.bin
1606e2078a377216a99b22f3b5746862bf79306c3ccab4de4fa4ec993dfe7c4f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD3F 11100 bytes

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