Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b427346cc6b12d8…

MALICIOUS

PDF

32.5 KB Created: 2020-05-16 01:55:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 513bcb5ae2790007db31f63473772fa6 SHA-1: a09e33baec0e1f821b9dc3f97579b511e1a0ed6a SHA-256: 0b427346cc6b12d868cbbcd280c2f643ca5d860311fd3fd6494a1e6dde2e4d44
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, many of which point to similarly structured URLs on different domains. This behavior is indicative of a link farm or a mechanism to distribute malicious content across multiple sites. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect users to potentially harmful web content, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://theclassyandjazzyboutique.com/uploads/1/3/0/3/130379169/130379169.html#check+if+null+crystal+report
    • http://createthefilm.com/uploads/1/3/0/6/130620520/8023519.pdf
    • http://qqconstruction.net/uploads/1/3/0/5/130543766/sisalowotobavuj.pdf
    • http://thelifestylelottery.com/uploads/1/3/0/2/130270955/8949902.pdf
    • http://ehneesa.com/uploads/1/3/0/8/130815664/degazilasap-vitasemope-laxikitatog-migasu.pdf
    • http://steelfabricationsaustralia.com/uploads/1/3/0/7/130738821/zipujatipajixilezaz.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_off000051b0.bin
55f250ee8875ac94cad29139ea8d7fb8a8f9b4e2c1eee90c4badabed24c73000		 pdf-font-stream PDF embedded font (sfnt) at offset 0x51B0 11132 bytes

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