Malicious PDF — malware analysis report

Static analysis result for SHA-256 b516bcd05dcfe0d3…

MALICIOUS

PDF

69.8 KB Created: 2020-12-27 00:53:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 55b4708dabd254ff4af18ef900443fbf SHA-1: 11a97cd76fd9ffe2d4d6d16e76167305a823c86c SHA-256: b516bcd05dcfe0d3d9da5a1a23003a7fb473f87ecbeee71d9074270b6480b9d9
126 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 for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The presence of numerous embedded URLs, many pointing to disposable hosting and link farms, strongly suggests a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a date, but no clear textual lure.

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://traffnew.ru/123?utm_term=decker+fire+colorado+springs
    • https://dekedenavit.weebly.com/uploads/1/3/4/6/134612093/rotor.pdf
    • https://static.s123-cdn-static.com/uploads/4444114/normal_5fe0ef7ba6693.pdf
    • https://static.s123-cdn-static.com/uploads/4409609/normal_5fca300d5de7c.pdf
    • https://bomobokoluv.weebly.com/uploads/1/3/1/4/131437025/2688734.pdf
    • https://direwuberegenis.weebly.com/uploads/1/3/4/3/134361890/9656795.pdf
    • https://xoxizanelanoruf.weebly.com/uploads/1/3/0/7/130740612/b62542b0fc07d.pdf
    • https://tupirusu.weebly.com/uploads/1/3/4/7/134702138/a18c6543e158b7.pdf
    • https://cdn-cms.f-static.net/uploads/4366048/normal_5f87187718bc3.pdf
    • https://static.s123-cdn-static.com/uploads/4426541/normal_5fc4ce50460cc.pdf
    • https://cdn-cms.f-static.net/uploads/4475216/normal_5fbf63cade56c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/vitelitubovuluj/saber_tooth_tiger_dnd_5e.pdf
    • https://s3.amazonaws.com/mipeboro/kgf_chapter_1_movie_video_song.pdf
    • https://uploads.strikinglycdn.com/files/23ca7c41-4a18-444e-b879-47711a492387/30267433600.pdf
    • https://uploads.strikinglycdn.com/files/a3fdff03-0204-44cf-8137-f5c811ef92fd/bazumu.pdf
    • https://s3.amazonaws.com/vukumesoj/rekebu.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_off0000d39b.bin
6030a1347e54b8c0c56616993f015d1d33f6ddf35241187bfb6eb002a14bc5ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD39B 5388 bytes
font_01_sfnt_off0000e60c.bin
f4e044aba1d2a9ab3d4e652916ae364217d85e387be01edac1fb1913ff155c30		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE60C 10492 bytes

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