Malicious PDF — malware analysis report

Static analysis result for SHA-256 74998b9befc96a37…

MALICIOUS

PDF

35.6 KB Created: 2020-04-04 14:37:54 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 5ef85bbb719a7e1a3b7f8b3d523a66d1 SHA-1: 1002986b081fca3f8071e38580c8a26b89140ac8 SHA-256: 74998b9befc96a37e34feca0f3d121910a7673e9a52cd59c881412d7f0d85b50
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links to various domains, many of which appear to be SEO-optimized and host PDF files. This suggests a link farm or redirection scheme designed to funnel users to potentially malicious content. The ML classifier strongly supports the malicious nature of this document.

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://kmipropertieslimited.com/uploads/1/3/1/3/131384300/131384300.html#astral+sorcery+attunement+altar+setup
    • http://boticateracora.com/uploads/1/3/0/3/130379213/jusipo_banarufugewo_ferovimi.pdf
    • http://stephenhallmarimba.com/uploads/1/3/0/8/130814596/tiniriguzidowigopeju.pdf
    • http://theandromedacollective.com/uploads/1/3/0/6/130640239/1431978.pdf
    • http://instegratedcorrosion.com/uploads/1/3/0/4/130435548/3691527.pdf
    • http://allstarcreditrepair.com/uploads/1/3/0/4/130494801/f93c53569073.pdf
    • http://firsthomecomputer.com/uploads/1/3/0/7/130738874/2561376.pdf
    • http://msert.net/uploads/1/3/1/4/131454466/wofomotula.pdf
    • http://4dvast.com/uploads/1/3/0/8/130874088/ximepe-xuxog.pdf
    • http://artvvork.com/uploads/1/3/0/6/130639729/9e47c199d.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_off000062f4.bin
113df6fedd3a129a7438d77bc9185e3a95069b28e3abd634693fdddc7f8f95e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62F4 7984 bytes

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