Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d226f247ceb0b01…

MALICIOUS

PDF

73.7 KB Created: 2020-12-20 10:44:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b8b7c879fe570b146c83321e0f8e77f9 SHA-1: d7f3955298ddd7d7f9254cd9f9b5cce67c5220f8 SHA-256: 1d226f247ceb0b013d8618068b5cb9d353e71446aee31b8ef60b3eaa151e938d
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting and exhibiting link farm characteristics, strongly suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection further confirm its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious intent, likely to redirect users to a compromised site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffking.ru/123?utm_term=justice+corps+san+diego
    • https://static.s123-cdn-static.com/uploads/4495043/normal_5fc7eef201800.pdf
    • https://guxolufesa.weebly.com/uploads/1/3/4/4/134468064/874b182cab275.pdf
    • https://vixijusodu.weebly.com/uploads/1/3/0/7/130776714/067c329.pdf
    • https://laxozutamof.weebly.com/uploads/1/3/4/7/134748247/2467646.pdf
    • https://cdn-cms.f-static.net/uploads/4468267/normal_5fa9ae6732c61.pdf
    • https://sozivutapadonen.weebly.com/uploads/1/3/1/1/131164462/f6ffa7e1a9c6.pdf
    • https://static.s123-cdn-static.com/uploads/4462341/normal_5fcaeb8d78db1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/7ec2ef76-6851-4b27-947a-001d4433c2e4/48053317574.pdf
    • https://uploads.strikinglycdn.com/files/46ebfab0-4152-4a88-a99e-e44e334d893d/33180851878.pdf
    • https://s3.amazonaws.com/fujadabez/z_movies_com.pdf
    • https://uploads.strikinglycdn.com/files/682406fe-a696-425f-a224-0b516d0660fd/45176075788.pdf
    • https://s3.amazonaws.com/sonutopexaramuf/chatuchak_market_map_2019.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e40e.bin
cd9437c8bdc41740ae4548e3116cf34f8affabb23245b99d5b27b1dda0e79946
pdf-font-stream PDF embedded font (sfnt) at offset 0xE40E 5196 bytes
font_01_sfnt_off0000f5c5.bin
6122ce42757cbcd792be648007ad419edd03adeaf766f65da88c464bb492ca18
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C5 10592 bytes