Malicious PDF — malware analysis report

Static analysis result for SHA-256 73686daa5c568203…

MALICIOUS

PDF

37.9 KB Created: 2020-04-07 20:14:16 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0a3e93ad91aa0fce9c8c26975cde6f0a SHA-1: 333a4b5caff520d7eef39c2f4d51a29bbe405f1a SHA-256: 73686daa5c56820327f2dee25950b8a55ca6a66efef253335528a9820469feb7
96 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded external links, a technique often used for SEO spam or to redirect users to malicious sites. The ML classifier strongly indicated maliciousness, and the heuristic firings confirm the presence of numerous external URIs. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to drive traffic to potentially harmful web content.

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://lakewoodelementary.net/uploads/1/3/0/7/130776420/130776420.html#dragon+ball+super+broly+movie+english+dub
    • http://phillystreetart.org/uploads/1/3/0/5/130589452/edad9852a51.pdf
    • http://allthingschildren.org/uploads/1/3/0/6/130604905/koribat_varuwazileduno_dasukewe_laletodenuwa.pdf
    • http://vtmconsultinggroup.com/uploads/1/3/0/2/130291531/lemavuwado.pdf
    • http://coronagoldensandgoldendoodles.com/uploads/1/3/1/1/131164122/6069780.pdf
    • http://jfsota.com/uploads/1/3/1/4/131437100/4986881.pdf
    • http://cass-travis-art.com/uploads/1/3/1/4/131453076/gefoweri.pdf
    • http://plenaformacenter.com/uploads/1/3/0/4/130492689/5417815.pdf
    • http://dananinkuyrugu.com/uploads/1/3/1/1/131163601/975938.pdf
    • http://gscareers.com/uploads/1/3/1/4/131406827/xuwepurata_wirane_jefitemugo.pdf
    • http://agingathometech.com/uploads/1/3/1/4/131453480/2245299.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_off00006be7.bin
dc60df1c7e34231d908932a3244619e460e18a6b15e45aa0202578af87aab465		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BE7 7912 bytes

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