Malicious PDF — malware analysis report

Static analysis result for SHA-256 6374b97cd785a999…

MALICIOUS

PDF

53.1 KB Created: 2020-04-08 15:12:51 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: fa4007e50cca4d2cb04761e5c731a302 SHA-1: 7617f8127b46cc632851126d1aeda4197d3df98c SHA-256: 6374b97cd785a999f1006489eb149db16d8971876597e4560dd9c0c7d0ab5630
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links to other PDF files, a technique often used for SEO manipulation or to distribute malicious content. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the suspicious linking behavior. The document body itself is heavily obfuscated and contains some of the linked URLs, suggesting an attempt to disguise the malicious intent.

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://exaktika.com/uploads/1/3/1/3/131397955/131397955.html#infecciones+de+vias+respiratorias+superiores+e+inferiores
    • http://themidwifecollective.com/uploads/1/3/0/7/130739437/4804f36fe965.pdf
    • http://clothesandconfidence.com/uploads/1/3/0/7/130776564/fisokifadeb-wukusijiwofopi-kedafe-zorele.pdf
    • http://lowreycorp.com/uploads/1/3/0/5/130550756/5474918.pdf
    • http://peak-performance-multisport.com/uploads/1/3/0/5/130551943/dajeforokawad.pdf
    • http://maisondelaroyaute.com/uploads/1/3/0/7/130776183/2369481.pdf
    • http://nastranskincare.net/uploads/1/3/0/4/130435982/8906756.pdf
    • http://francescovalentina.com/uploads/1/3/0/3/130379178/1c249.pdf
    • http://virginislandsansuh.com/uploads/1/3/0/7/130740110/5b01be5.pdf
    • http://starmapseries.com/uploads/1/3/0/5/130589238/797f246ef.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_off0000a6ee.bin
9958e2d77204e4742d73441d92a5c7aec6ffa0b0a3c58da3e81c5b562ec77c6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA6EE 9112 bytes

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