Malicious PDF — malware analysis report

Static analysis result for SHA-256 f67b92b187c2eb38…

MALICIOUS

PDF

34.6 KB Created: 2020-04-11 13:16:16 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 363a3cb42621acc9afd32365def2a2c5 SHA-1: f9ea746433719fc9203c901bb021bfd43e5f58b6 SHA-256: f67b92b187c2eb3820d5b7257282076268192f4eb56e9c9f3281dd6509bae496
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a large number of external links, many of which point to other PDF files with numeric or generic slugs, indicative of a link farm or SEO spam campaign. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains text related to an academic exam and metadata from wkhtmltopdf, suggesting a deceptive lure. The primary intent appears to be directing users to a network of potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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 http://myjgallagher.com/uploads/1/3/0/3/130313309/130313309.html#examen+de+tercer+bimestre+de+sexto+g
    • http://kauaipilatescoach.com/uploads/1/3/1/4/131483009/lulapeninaru.pdf
    • http://charleslstreet.com/uploads/1/3/0/7/130776131/titaxu.pdf
    • http://landnet.info/uploads/1/3/1/4/131438379/bbc29683403.pdf
    • http://1wordllc.net/uploads/1/3/0/2/130289662/0869f25d918.pdf
    • http://shoptail.org/uploads/1/3/0/2/130288338/fumazupubid.pdf
    • http://aviplan.net/uploads/1/3/0/3/130313149/473686.pdf
    • http://adriekeosmun.com/uploads/1/3/1/4/131483520/wazur-fuxiv.pdf
    • http://cornislandphotography.com/uploads/1/3/1/0/131070456/bajexezegulobuli.pdf
    • http://getsafeleads.com/uploads/1/3/0/4/130488101/malunarobukuwa.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/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005c9f.bin
15d71ed2fa7916c8eb63ce73d1f2b36e0135bbabb35c6b498c7aaa0a0aae5e2b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C9F 9040 bytes

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