Malicious PDF — malware analysis report

Static analysis result for SHA-256 6370af268d42111b…

MALICIOUS

PDF

42.5 KB Created: 2020-04-21 01:13:30 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 6d389db5cffcb5148e23ba9d5b629faf SHA-1: 3c89255ce7e67425244d1ab9b767999cba0ab664 SHA-256: 6370af268d42111b6e037969b3d10f9a54ac6e222b217ac3e4ee1a9dd36c4a40
96 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links to external websites, many of which appear to be part of a link farm designed for SEO manipulation or to host malicious content. The ML classifier strongly indicated maliciousness, and the presence of external URIs suggests an attempt to redirect the user to potentially harmful sites. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://jbraun4indy.com/uploads/1/3/0/9/130969072/130969072.html#contact+us+page+template
    • http://pinnentgrp.com/uploads/1/3/0/6/130604354/3615484.pdf
    • http://blunderist.com/uploads/1/3/0/4/130489377/214d7bf01.pdf
    • http://adventcustomhomes.com/uploads/1/3/0/5/130540525/1511586.pdf
    • http://techno-partners.net/uploads/1/3/1/3/131379732/3065284.pdf
    • http://tropicaltrunks.com/uploads/1/3/0/5/130551488/3049049.pdf
    • http://ultrasoundrepairs.com/uploads/1/3/1/3/131379405/vizuruwalinedak.pdf
    • http://vetpoint.us/uploads/1/3/0/4/130435710/lumukat_nuxukex_maboruduvamo.pdf
    • http://thelogoanimator.com/uploads/1/3/0/6/130621873/mamitu.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_off00007ef0.bin
26cce9434984b29f53a8f85e5ae3239f77494a54276595dbd22e85f2b009867f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EF0 8128 bytes

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