Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cc676b4f176ac4b…

MALICIOUS

PDF

37.4 KB Created: 2020-03-26 08:21:02 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 5fe690e9fac1fd8e6aa4c93539fd4276 SHA-1: 27df9061729976b9eb37a9ff278d9ec0b1088c84 SHA-256: 0cc676b4f176ac4b18e52ec3fd1f1c5744fb47497b698233ade5334c9051883d
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1190 Exploit Public-Facing Application

The PDF document contains a large number of embedded external links, identified as a link farm. The primary purpose appears to be SEO manipulation or directing users to potentially malicious content hosted on numerous domains. The ML classifier strongly indicated maliciousness, supporting the suspicious nature of the link farm.

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://kohno-corp.com/uploads/1/3/0/6/130620370/130620370.html#respuestas+de+matematicas+1+grado+secundaria
    • http://epicenterstyle.com/uploads/1/3/0/6/130621642/pufadusomaru.pdf
    • http://filmmusicartsfestival.net/uploads/1/3/0/7/130776449/b48ff2c13ca3e42.pdf
    • http://canvasmcgill.ca/uploads/1/3/0/5/130543025/pifutasadu-lafumolefatin.pdf
    • http://kc-electricalconstruction.com/uploads/1/3/0/4/130490193/zoxijatese-vavikarisaze.pdf
    • http://liquidluau.net/uploads/1/3/0/7/130775820/6671c7cbdd98.pdf
    • http://jakebrenneise.com/uploads/1/3/0/8/130814110/nutuken.pdf
    • http://ecosource.co.uk/uploads/1/3/0/4/130476469/1705132.pdf
    • http://mschris.net/uploads/1/3/0/6/130621502/kujava.pdf
    • http://www.alplus.de/uploads/1/3/0/8/130813144/cc925f38.pdf
    • http://www.cxmconstructionllc.com/uploads/1/3/0/4/130435602/patap-zozumib-bilasodag-vigigosagokiduw.pdf
    • http://milesoftinysmiles.com/uploads/1/3/0/6/130639162/fopotutumifewu_xapekazut.pdf
    • http://kizargraphics.com/uploads/1/3/0/7/130739093/626950.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_off00006737.bin
91db78f9b21a648d3898c6c0f2c675ea5a926ce106ad79823f54aaac4c908cf7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6737 8644 bytes

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