Malicious PDF — malware analysis report

Static analysis result for SHA-256 a33aaeb8f0131a89…

MALICIOUS

PDF

78.5 KB Created: 2020-11-28 05:49:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: a4f32a93ba6a0b3663bdb4053bf6b656 SHA-1: 3968cdfa8bd4f06a24b84ae6dc41a687f7e7f96a SHA-256: a33aaeb8f0131a89f7fa805b80aa05257a37fb4173a3f4cb369566dbaf73d279
96 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains an embedded URL that masquerades as a product manual, likely to trick users into clicking it. The PDF structure itself is also noted as having duplicate objects, which can sometimes be used for evasion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffset.ru/123?utm_term=ihome+ibt60+bluetooth+speaker+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366645/normal_5f8b8f152b9bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464521/normal_5fc1b682e9892.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417214/normal_5fba1ef00ebc6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369760/normal_5f8a93cf8c7cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426549/normal_5fa9dc55462ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366036/normal_5f888e6602d5a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424037/normal_5fa414af6afb9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383327/normal_5f8d64dea9891.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/jewizopukuni/devil_costume_ideas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bd7ce10-f1b6-4c07-84d7-03129b159732/dagujakonowi.pdfIn PDF document text
    • https://s3.amazonaws.com/senodiw/linear_programming_notes_class_12.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A2 5380 bytes
SHA-256: 440749156adfbd4d0939d41ba4ebc3a83499e2aa616d3573b77865eec872b6f0
font_01_sfnt_off0000f4b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B5 12832 bytes
SHA-256: 15b48dbbf8a27bb3db7031d201a6213f4ddda46c94892e6c416abb88b0f3daf1
font_02_sfnt_off00011f3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F3D 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2