Malicious PDF — malware analysis report

Static analysis result for SHA-256 d40f50874a35f0b8…

MALICIOUS

PDF

81.8 KB Created: 2021-02-11 17:39:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: c75a9cbf694212ac2cd4a3bada4ff803 SHA-1: 0855f1bd9512864f2514f29af4169d6531423520 SHA-256: d40f50874a35f0b8641de0c869dc928ba3cec243e771090a40df02ee0a16a43c
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The presence of numerous external URIs, many hosted on disposable domains or link farms, strongly suggests a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf', indicating it was likely generated programmatically to obscure its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://baarspo.ru/123?utm_term=substantive+vs+procedural+democracy PDF link annotation
    • https://cdn.sqhk.co/papusabefo/FLhjhbj/22324238930.pdfIn PDF document text
    • http://hopecommunitynaz.com/lokabewawosegosikebimv68b.pdfIn PDF document text
    • https://juxipibofo.weebly.com/uploads/1/3/5/9/135985723/6084243.pdfIn PDF document text
    • https://cdn.sqhk.co/luxixumogez/puibif1/nivavusotuzaliwof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380705/normal_600fdefa2aa76.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412570/normal_6018b97ce28ef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492278/normal_5ffe68794271a.pdfIn PDF document text
    • https://dibevapanowodi.weebly.com/uploads/1/3/0/7/130776811/2140782.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500201/normal_5ff0bf5284575.pdfIn PDF document text
    • http://mmuuue.space/jodha_akbar_tamil_hd_videoir0m1.pdfIn PDF document text
    • https://sinonulu.weebly.com/uploads/1/3/4/6/134654736/7502440.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367007/normal_6006e1cebe553.pdfIn PDF document text
    • https://sefujokugitexas.weebly.com/uploads/1/3/1/4/131408298/wajakeporugekov.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486981/normal_602232fa8b51b.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
    • http://madanekobovuge.epizy.com/asure_id_2009_software.pdfIn PDF document text
    • http://lorenivi.rf.gd/11630886238.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_off0000f481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF481 5508 bytes
SHA-256: 592ef091b42d88cca5a09a648ce2b4131ecec110dd63d9166466c9dc35807890
font_01_sfnt_off00010718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10718 10992 bytes
SHA-256: 90ac0a237fc76ae6886c7b8b4b8d1846b984c9cd0577e6f34c6644694f13e4ad
font_02_sfnt_off00012c0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C0E 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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