Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5b9c45c95ef7a63…

MALICIOUS

PDF

69.1 KB Created: 2020-11-20 04:05:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1e73d7b93d6b3c2fa49967893bea4357 SHA-1: 4eea9832b603b96ccfd53675393489b9beacb367 SHA-256: f5b9c45c95ef7a63eb62bd154f75a2f92a8b696451bdd9d5c1169064ed23226e
96 Risk Score

Malware Insights

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

The PDF file contains a heuristic indicating an external URI, which points to a suspicious domain. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the presence of an embedded URL and the overall detection profile indicate an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=bay+window+ideas+outside
    • https://cdn-cms.f-static.net/uploads/4449177/normal_5fad871aa22eb.pdf
    • https://cdn-cms.f-static.net/uploads/4378171/normal_5f8b43416d0fa.pdf
    • https://cdn-cms.f-static.net/uploads/4422658/normal_5f98fc2162c93.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/fujadabez/wilaperefejetijanasutoxu.pdf
    • https://s3.amazonaws.com/bajapovogam/wegopuvigidadewoxegomalu.pdf
    • https://s3.amazonaws.com/remuv/24998937675.pdf
    • https://s3.amazonaws.com/damerirazib/bad_romance_lyrics_video_youtube.pdf
    • https://s3.amazonaws.com/nuselufuzo/background_blur_photos.pdf
    • https://s3.amazonaws.com/xewamejixolefaj/46927884835.pdf
    • https://uploads.strikinglycdn.com/files/34d1d6b4-0109-49e5-9f51-35e3557f03bd/vuwozuwe.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c5f2.bin
7d53d3a1e0c9147f2bb965dcf8bb875a26d9480e02ccbd4e4190c6d32a7b6e1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC5F2 4816 bytes
font_01_sfnt_off0000d675.bin
c79df495989e7f3002709077e8014e7695a5d2e68f29d90b3e03e9fc7a9d01be		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD675 10468 bytes
font_02_sfnt_off0000f9bd.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BD 4324 bytes

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