Malicious PDF — malware analysis report

Static analysis result for SHA-256 cae49c055cb580ca…

MALICIOUS

PDF

35.3 KB Created: 2020-04-16 03:59:30 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2fbd44d1a9e780cb0d01ca9ed1910c46 SHA-1: 8ff92187baea519cbdbf5fac21e4cd2ca6aff853 SHA-256: cae49c055cb580cad56dae948898e9c29ae26f12b3600d3198eecfd4ea3d9eef
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly indicated maliciousness. The document body contains a URL that appears to be part of this link farm. The primary function seems to be directing users to a multitude of other PDF documents hosted on various domains, likely for SEO manipulation or to serve as a distribution point for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://iavnt.com/uploads/1/3/0/2/130288006/130288006.html#home+again+movie++mp4
    • http://hollomanafbcrashpad.com/uploads/1/3/1/4/131437937/7477864.pdf
    • http://muslimstoreid.com/uploads/1/3/1/4/131437859/muxagusuja-kabeb.pdf
    • http://gsaccountancy.com/uploads/1/3/0/4/130476010/2183804.pdf
    • http://maggiebohannon.org/uploads/1/3/0/2/130271061/797d7d34bf59.pdf
    • http://rachaelmtp.com/uploads/1/3/0/4/130494743/ritivivifetabugajip.pdf
    • http://dhinvestmentpartners.com/uploads/1/3/0/6/130621569/wanizusiwobol.pdf
    • http://grahaminvestmentrealty.com/uploads/1/3/0/5/130588921/nururexifoxaruj_wugeme_zepetopoga_negab.pdf
    • http://frescosexpress.com/uploads/1/3/0/2/130272877/e581d100ccb1336.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_off00005e7b.bin
55c4ec6ef087daf1deb7143154485cc4ffc65fc9622fe046347112db548a7c6f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E7B 9524 bytes

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