Malicious PDF — malware analysis report

Static analysis result for SHA-256 137652313f9aa70c…

MALICIOUS

PDF

47.0 KB Created: 2020-04-10 06:30:16 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 73d99911d25628759da5972bacb49894 SHA-1: fbd028b9373a17cd0139d3c8c8cfa0383498c426 SHA-256: 137652313f9aa70cb12787e748f1995f07186591d26baf923903a53339594519
96 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many of which point to suspicious domains and appear to be part of a link farm. The ML classifier strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to potentially malicious content, possibly for SEO manipulation or to host further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://rossloto.site/uploads/1/3/0/6/130603942/130603942.html#derechos+segunda+generacion+argentina
    • http://uneqsaromatherapy.com/uploads/1/3/0/5/130539350/wixavopulivonakuk.pdf
    • http://gitaro.net/uploads/1/3/0/3/130312998/kulajip_kiteri.pdf
    • http://jenssnoshack.com/uploads/1/3/0/6/130639521/963477d0.pdf
    • http://mobile-brakes.com/uploads/1/3/1/4/131437784/gomubinobopag.pdf
    • http://teambonaventure.com/uploads/1/3/0/6/130620395/zuvodadagibix.pdf
    • http://oroxflexo.com/uploads/1/3/0/2/130289397/koxotilixug.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicense
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006d2a.bin
ef348a3b2f479212cc9b652288f78f51e2a22e908c312c1461a564bf88095f3a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D2A 9212 bytes
font_01_sfnt_off00008eb1.bin
e91619dfd4c72a85464d95ef1ba4e67df13020651c42071bafbe521a61d9f7fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8EB1 2652 bytes
font_02_sfnt_off00009818.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9818 16036 bytes

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