Malicious PDF — malware analysis report

Static analysis result for SHA-256 f074b1ae1b1a82b6…

MALICIOUS

PDF

36.3 KB Created: 2020-06-18 09:46:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: ce486066f3889cb7a197a8b26cc2e31a SHA-1: 783c1811eec07749eb53c1ffda0c5ec025d426e7 SHA-256: f074b1ae1b1a82b60372041fbe91183a9939b4b0592685a438757d246718c11c
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links to various domains, many of which appear to be part of a link farm. The ML classifier strongly indicated maliciousness, and the PDF structure suggests it's designed to direct users to these external sites. While no scripts were explicitly extracted, the nature of the embedded links and the heuristic firings point towards a malicious intent, possibly for SEO manipulation or to host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://store.healmarketplace.com/uploads/1/3/0/2/130289546/130289546.html#the+purpose+of+writing+pdf PDF link annotation
    • http://larsonmediation.com/uploads/1/3/0/8/130813401/5145573.pdfIn PDF document text
    • http://daytonmlslasertherapy.com/uploads/1/3/1/3/131398104/jotunojizevesemod.pdfIn PDF document text
    • http://mazila.co.za/uploads/1/3/1/6/131637558/3c67de7f634b73.pdfIn PDF document text
    • http://nikitaflynnphotography.com/uploads/1/3/0/8/130874088/9160853.pdfIn PDF document text
    • http://mynapervillecpa.com/uploads/1/3/1/3/131379939/6412256.pdfIn PDF document text
    • http://sophistable.com/uploads/1/3/1/3/131383646/lifozasaj.pdfIn PDF document text
    • http://kathywilliamstolstrup-lpc.com/uploads/1/3/0/2/130289623/kusuvaxixus.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5454 4984 bytes
SHA-256: 73032619e3ef34e34c5f8b03548bed6f0e1292c056209e5e502dde14a344ee7f
font_01_sfnt_off0000654f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x654F 9532 bytes
SHA-256: 64d84562955b9f5dded8c31aa3b97c63dbd207cd650c39bf1afa7fdea110cfa8