Malicious PDF — malware analysis report

Static analysis result for SHA-256 91dceb3e2180a4c8…

MALICIOUS

PDF

80.9 KB Created: 2021-03-28 18:41:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: ae90aeee068f132e7a8538096e13938a SHA-1: 89121417f1d029ca7eddf4b2a27acae634eada83 SHA-256: 91dceb3e2180a4c879f770b419415c7b63551b5a94a949247b2df46d339ac497
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains heuristics indicating an external URI and is flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The embedded content, though heavily obfuscated, suggests a lure related to 'Ap statistics quiz 3.2 b answers' to entice users to click the malicious URL. No scripts were extracted, but the presence of a malicious URL and the nature of the lure point towards a phishing or malware distribution attempt.

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://jacksth.ru/wix?keyword=ap+statistics+quiz+3.2+b+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4408984/normal_601ad6aa76091.pdfIn PDF document text
    • https://cdn.sqhk.co/dudugetogi/jeShjhj/52934839422.pdfIn PDF document text
    • https://cdn.sqhk.co/pasojixaju/xhjjiH2/reapers_revenge_tickets_online.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408984/normal_603bf1abe4ab2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402481/normal_60542cc23305a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467274/normal_5fcb779b149da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391909/normal_601d99d9c5cc0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382423/normal_5fde76a65e8dd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493200/normal_5fe17b33cc84f.pdfIn PDF document text
    • https://cdn.sqhk.co/sotisajen/5HSlggV/34084170494.pdfIn PDF document text
    • https://cdn.sqhk.co/vadavenaw/rhbheha/jersey_fitted_sheet_meaning.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/30e682d5-df10-40cb-bf8e-aac48465120b/how_to_beat_the_stock_market_game.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e19bd434-2937-4b71-ab65-67050c959181/que_numero_es_el_buzon_de_voz_telcel.pdfIn PDF document text
    • https://73b3f487-90f5-41a6-bf44-750372f72efd.filesusr.com/ugd/39e8d0_499b8d8303ea401e8f2558d18d4c54e0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/27ab93dc-5c9c-434d-98cd-9908c5dc4469/when_god_winks_at_you_free.pdfIn PDF document text
    • https://6739ca04-605d-4ff4-b4c9-4e5bd75a7819.filesusr.com/ugd/031dda_e3f18f1c6235427d9ae8da0d735a167a.pdf?index=trueIn PDF document text
    • https://87164119-88a6-4d6d-a72f-b109cf2d88b9.filesusr.com/ugd/bd0a66_cc197c08706b44e9b82e71d2e46fedda.pdf?index=trueIn 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_off0000f96f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF96F 5620 bytes
SHA-256: 9136483b41c59bcbfb0275128945775039e40707b1d2e9a716584e6470a11e23
font_01_sfnt_off00010cc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC4 12312 bytes
SHA-256: 51baf491002afc6e1121ab5f4c879ae9898df53ef0b1988801b7796294344757

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