Malicious PDF — malware analysis report

Static analysis result for SHA-256 b82f013ea1a10609…

MALICIOUS

PDF

37.5 KB Created: 2020-04-08 20:14:21 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0e5f79e4f420b26ecd03791566fd6e28 SHA-1: 2f892d27ca21b90dbc13d44b74bb2274aae8cc85 SHA-256: b82f013ea1a1060950e07e7ddab80856693469134bad36acb69d63f49f8cfa7e
94 Risk Score

Malware Insights

MITRE ATT&CK
T1598 Gather Victim Identity Information T1204 Malicious Link

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The document body contains a reference to a 'Kubota diesel engine repair manual d905', which appears to be a lure to disguise the true nature of the document. The primary function of this PDF is to act as a link farm, likely for SEO manipulation or to distribute further malicious content via the linked PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://oceanbeachkitchenandbathremodel.com/uploads/1/3/0/4/130483519/130483519.html#kubota+diesel+engine+repair+manual+d905
    • http://mjflickdesign.com/uploads/1/3/0/4/130476062/2103137.pdf
    • http://organizeme.guru/uploads/1/3/0/2/130287735/f31ed939b54.pdf
    • http://nspiresalonatx.com/uploads/1/3/0/7/130740068/9c495b691ec6f71.pdf
    • http://shenleys.com/uploads/1/3/0/7/130740496/8489139.pdf
    • http://rollinghillsfrenchies.com/uploads/1/3/1/4/131437711/b380ea7135.pdf
    • http://afrowestlogistics.org/uploads/1/3/0/5/130539053/dagidematojoludage.pdf
    • http://dashpointdaycamp.com/uploads/1/3/0/6/130621706/xugakekala-powovatezatelo-vorupefeber.pdf
    • http://employeeadvocatecenter.org/uploads/1/3/0/9/130969497/1803667.pdf
    • http://minutemengundogs.com/uploads/1/3/0/7/130740496/fuvojewokorizufet.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006170.bin
ec6a67d1cbfd40defda36ba44df4808fc8dcfdaf37acbdd68a23136fcf3e75fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6170 7516 bytes
font_01_sfnt_off00007ef3.bin
4d9ec2aec8f1ca6bebe1b56492fd55a77bba3a6e98efb76508c1b835d4eb9912		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EF3 2860 bytes

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