Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f154516784418e2…

MALICIOUS

PDF

30.5 KB Created: 2020-04-19 11:28:43 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2744207c7819cb25fc5b002115f21ff3 SHA-1: 408adbc06d87fc9e00ee8c869daffcc61c2baa79 SHA-256: 6f154516784418e2edf8874dfe7418506075f7a8962403b80fab8f47304f3865
96 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm or SEO spam, containing numerous embedded URLs pointing to external PDF documents. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a mass external link farm. While no scripts were explicitly extracted, the embedded URLs suggest a potential for distributing further malicious content or engaging in SEO manipulation. The primary attack pattern involves directing users to a large number of external resources.

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://switalia.com/uploads/1/3/1/4/131454165/131454165.html#django+render+template+example
    • http://savvycommunications.org/uploads/1/3/0/6/130605355/xorojovujibuvo.pdf
    • http://criminallegendsboston.com/uploads/1/3/0/6/130640191/da52305.pdf
    • http://mundarebakery.com/uploads/1/3/1/4/131438062/jukopes.pdf
    • http://clconstruction413.com/uploads/1/3/0/5/130589416/kewen.pdf
    • http://capturedbycamo.com/uploads/1/3/1/4/131408838/1379544.pdf
    • http://robuccio.ca/uploads/1/3/0/6/130620320/diboriv.pdf
    • http://brightplan.co/uploads/1/3/0/7/130738484/puzemideram.pdf
    • http://saskiarooijakkers.com/uploads/1/3/0/8/130874194/3863585.pdf
    • http://chickything.com/uploads/1/3/0/6/130639661/3811585.pdf
    • http://newmandiamonds.com/uploads/1/3/1/4/131456012/721ed3f19c.pdf
    • http://tylernjoten.com/uploads/1/3/0/7/130776324/e4013f6409eb.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_off00005080.bin
3098b24643099c8dd1b4f68be24a151b510163228ff59a5875c317b3ae776f16		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5080 7600 bytes

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