Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c41405f5b710f66…

MALICIOUS

PDF

68.0 KB Created: 2021-01-15 11:49:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 2d277e9191c9e944f0926bcfe8ee6b79 SHA-1: e50f0f6919c6882a00fe41f3b3ffdc128e725092 SHA-256: 9c41405f5b710f66055d94c98baa2e0b56ae5d05bcce253915599eb3a3b85fa4
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to 'trafffe.ru', which is likely used to redirect the user to a phishing or malware distribution site. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

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://trafffe.ru/123?utm_term=al+roker+salary PDF link annotation
    • https://cdn.sqhk.co/kepilujofeje/eBjeib6/adidas_winter_hiker_speed_climaproof_primaloft.pdfIn PDF document text
    • https://cdn.sqhk.co/bufutoje/fzQidtv/drift_of_positive_ions.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422627/normal_5fe3b53e2e6cc.pdfIn PDF document text
    • https://cdn.sqhk.co/fusatogis/aYyjbgc/clicker_heroes_2_cool_math.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386073/normal_5fd9af73ad3db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414159/normal_5fa73196f1dde.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414501/normal_5fc21cd9d32d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492918/normal_5fb38c9edd68f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491169/normal_5fbefc51eaff9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470843/normal_5fa66d0604ed8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369164/normal_5f9148cb25609.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416322/normal_5fd06a3cd72d9.pdfIn PDF document text
    • https://site-1084153.mozfiles.com/files/1084153/gadonitabukuriwo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000cf48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF48 4836 bytes
SHA-256: 40e68b78591e980c684b11632b9b232f2e6dff76da0a1a104420e3a5dac170d2
font_01_sfnt_off0000dfce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFCE 10624 bytes
SHA-256: b17a8ac3de88040ddd3df3b00e87c60d531b966cf2aee3304d15636bf7c701cc

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