Malicious PDF — malware analysis report

Static analysis result for SHA-256 759c6b573792046c…

MALICIOUS

PDF

45.1 KB Created: 2020-05-14 23:52:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c46768ab52dcc4173f27829fa0d80df7 SHA-1: 2ae38ba9a13ab49fe204f5033258a7cb889a6786 SHA-256: 759c6b573792046c90b28aad7d260461d51ad67c039426066aef998806746c16
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to similarly structured URLs, indicating a link farm or SEO spam campaign. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://overdriveglobal.net/uploads/1/3/0/6/130604602/130604602.html#hiram+na+salita+worksheet+grade+3
    • http://ctksebastian.org/uploads/1/3/1/4/131437977/busid_jozub.pdf
    • http://justfortodayrelax.com/uploads/1/3/1/1/131164046/0c4df7e13.pdf
    • http://reeserracecars.com/uploads/1/3/0/5/130588157/5267583.pdf
    • http://paperdollsandoutlaws.com/uploads/1/3/0/4/130435898/loropozumabisonugi.pdf
    • http://middlebloom.com/uploads/1/3/1/3/131381471/820619.pdf
    • http://aerialadvantagepoint.com/uploads/1/3/0/9/130969061/8374114.pdf
    • http://tridentjobs.com/uploads/1/3/0/7/130739793/5316683.pdf
    • http://madelineliao.com/uploads/1/3/0/5/130543656/8400438.pdf
    • http://countrymusicpromo.com/uploads/1/3/1/3/131381675/d3d7ee56f65.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_off0000823c.bin
5127374285a3abd8f8ed63fb999bf825b0b3198e5d49a17ab43cc63dc8a349bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x823C 11104 bytes

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