Malicious PDF — malware analysis report

Static analysis result for SHA-256 089963fc15e0e1e3…

MALICIOUS

PDF

67.8 KB Created: 2020-03-15 06:16:03 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: fa1855453d0cf28832012eced7507460 SHA-1: 976a9a2f82af7d18b317b587b6014eda446683b8 SHA-256: 089963fc15e0e1e353c948fd09188f5c6715cff4ad05488fbc17b7239c58e558
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, which is a common tactic for SEO manipulation or distributing malicious content. The ML classifier strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to potentially harmful content hosted on numerous domains.

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://adsl-63-204-18-62.benefitplans.org/uploads/1/3/0/6/130604533/130604533.html#microbial+assay+of+antibiotics+pdf
    • http://www.emilyblake.net/uploads/1/3/0/7/130776316/nalixezo.pdf
    • http://impactmesh.net/uploads/1/3/0/6/130621075/2f3dd7.pdf
    • http://stanthonyrummage.org/uploads/1/3/0/7/130738710/4492521.pdf
    • http://artfusionwest.com/uploads/1/3/0/7/130775907/7132350.pdf
    • http://acasey2.xyz/uploads/1/3/0/7/130775817/1da436b2bda.pdf
    • http://phillywaxing.com/uploads/1/3/0/5/130588467/4604027.pdf
    • http://www.msgarcia.com/uploads/1/3/0/5/130590689/24661bf9.pdf
    • http://hibulli.com/uploads/1/3/0/8/130873927/92fc541f8ec.pdf
    • http://www.batremovalprofessionals.com/uploads/1/3/0/4/130476101/kopezenoguju.pdf
    • http://taocostarica.com/uploads/1/3/0/5/130542977/6273868ab7.pdf
    • http://kingdomdvlpr.com/uploads/1/3/0/7/130739170/9283088.pdf
    • http://epsaofficial.eu/uploads/1/3/0/2/130289569/8233768.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_off0000dfab.bin
d11d714878bf414602699f714ab0fe0961478e21a547fd1aa1af583cb633af45		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFAB 9084 bytes

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