Malicious PDF — malware analysis report

Static analysis result for SHA-256 6aa3559bb15a4864…

MALICIOUS

PDF

28.5 KB Created: 2020-05-17 08:42:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c9b90cc2c60466f96d03df6b55c83985 SHA-1: a027268a41b0f7f355041dd5778f464bcc790481 SHA-256: 6aa3559bb15a4864cd4dc91dc71ad7e1fc78d518d56bc3a21f1c96e1db5109f0
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, forming a link farm designed to redirect users to various other PDF files hosted on different domains. The document body, though heavily obfuscated, contains references to 'Antenatal care' and URLs that appear to be part of this link farm. The ML classifier strongly indicates maliciousness, and the presence of numerous external links suggests a campaign to distribute further malicious content or engage in SEO manipulation for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://growfoodnotdebt.com/uploads/1/3/0/6/130605505/130605505.html#antenatal+care+kemenkes+pdf
    • http://australianchartsreport.com/uploads/1/3/0/6/130621447/14a44.pdf
    • http://ilchousingcic.com/uploads/1/3/0/7/130776221/wudomi.pdf
    • http://jperealty.com/uploads/1/3/1/3/131379409/9519363.pdf
    • http://mydignitymypride.com/uploads/1/3/0/6/130639954/5006395.pdf
    • http://hobusarealty.com/uploads/1/3/1/8/131857204/6952806.pdf
    • http://toplineconcierge.com/uploads/1/3/0/5/130543538/bejerubepuxubikodar.pdf
    • http://saunderslegal.com/uploads/1/3/0/4/130488101/8345755.pdf
    • http://kingofthecooptampa.com/uploads/1/3/1/3/131380493/vakelimokusu.pdf
    • http://battlegroundfunctionalperformance.com/uploads/1/3/0/2/130289700/genimas.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000046c7.bin
deb267e2fcb5cda906acb28cbf5fe329e471b5c4aebe2d85061b93ea1b29a3c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x46C7 9508 bytes

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