Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9f64b7d2daaee72…

MALICIOUS

PDF

63.1 KB Created: 2020-11-16 13:40:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: d58a217f81d595631bb534f356fb5e5f SHA-1: d92d954c96bde5946892de492de91200690ca36b SHA-256: b9f64b7d2daaee721b5bf9caeb8eb2b444821462d67831231aff5943b507c7db
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://cctraff.ru/strik?utm_term=writing+equations+of+parallel+lines In PDF document text
    • https://cdn-cms.f-static.net/uploads/4370791/normal_5f8a4058c83b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383156/normal_5fa5e18f95b49.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419236/normal_5f9a091f5c843.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gedimuta/second_chance_thrift_store_reedley.pdfIn PDF document text
    • https://s3.amazonaws.com/bulozor/1666584662.pdfIn PDF document text
    • https://s3.amazonaws.com/bepukuba/zisaxigikatode.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/gifesegeg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0027fde3-b7f7-4a16-b24c-73792667619e/angulo_de_elevacion_y_depresion_ejer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15f824cd-449e-416f-b8b5-312dac3e04c9/apk_minecraft_download_for_xbox_360.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef494d0e-7d62-40b4-bdaa-702496cb008f/91865651464.pdfIn PDF document text
    • https://s3.amazonaws.com/tefelaj/tozotetufuwem.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/public_policy_theory_ppt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b70decd6-9e42-4160-bf11-2e87e0ff5fbc/vertical_redstone_power.pdfIn PDF document text
    • https://s3.amazonaws.com/zazelujeju/prostate_cancer_treatment_guidelines_2018.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_off0000b708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB708 5208 bytes
SHA-256: e194ae09629337e22e4f1d23db13b7b6771887738f1a5baca3825e4770055f79
font_01_sfnt_off0000c8e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8E0 11348 bytes
SHA-256: e88fae3034ababf9991c6fbf15da76695121cf3f492274900836220e3f5328e8

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