Malicious PDF — malware analysis report

Static analysis result for SHA-256 7198050a51c29f77…

MALICIOUS

PDF

47.8 KB Created: 2020-04-08 01:31:07 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d30882bae1eaf848508fbcb7131a46ff SHA-1: 46ad5b7cc4fb011f3d0756382dfec11782585f04 SHA-256: 7198050a51c29f773c75b837d515b94b2c6ee63dfeccb31a403d232b66eb1e28
96 Risk Score

Malware Insights

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

The PDF document was flagged by an ML classifier as malicious and contains a large number of external links, indicating a potential link farm or redirection scheme. The embedded URLs point to various domains, many of which appear to be part of a coordinated effort to host or link to further malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URI heuristics suggest an attempt to direct the user to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://niskuprojects.com/uploads/1/3/0/2/130288924/130288924.html#introduccion+a+la+fisica+moderna
    • http://tender1.net/uploads/1/3/0/8/130874413/6660da62e04.pdf
    • http://planetlifeus.com/uploads/1/3/0/4/130483349/312324c2fe5dae5.pdf
    • http://khaliafrazier.com/uploads/1/3/0/4/130489044/03b1caa1.pdf
    • http://singletonpropertygroup.com/uploads/1/3/0/4/130436159/biragudelafamaj_vubirokexu.pdf
    • http://highlightedbooks.com/uploads/1/3/0/7/130740257/2695188.pdf
    • http://nasimofoods.com/uploads/1/3/1/3/131379398/6434142.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_off000090d8.bin
d43144a34c9c2e882a3bc8523c2b8cbc00bc9287aa7297d443a7a88a67ea95d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x90D8 8980 bytes

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