Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9d3bb92b623f9cc…

MALICIOUS

PDF

46.9 KB Created: 2020-04-05 07:04:37 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 278488de55fb5a4dc73c154c915ee105 SHA-1: 27ccbdd56c667938633d894a671b750fabdb8bf2 SHA-256: d9d3bb92b623f9ccd8613d42b16f34310172ac862d4008dcbf0f882cf8f2343e
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links to other PDF documents, a technique often used for SEO manipulation or to host malicious content. The ML classifier strongly indicated maliciousness. The document body, though partially corrupted, contains a URL that is part of this link farm, suggesting a lure to external content.

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://goodheartcleaning.com/uploads/1/3/0/5/130589429/130589429.html#como+hacer+una+auditoria+interna+de+calidad
    • http://ginslovmediastudio.com/uploads/1/3/0/5/130589054/d33121a.pdf
    • http://iriskservices.nl/uploads/1/3/1/0/131069753/43aec.pdf
    • http://smarterhomesconstruction.com/uploads/1/3/0/5/130543798/5804907.pdf
    • http://nles-boutique.com/uploads/1/3/0/6/130604165/7108311.pdf
    • http://novellaproposals.com/uploads/1/3/0/8/130874045/95774.pdf
    • http://middletennesseeflyfishing.com/uploads/1/3/0/5/130590416/lufeposowori_mupini_pepasave.pdf
    • http://jesstlt.com/uploads/1/3/0/7/130776047/6ff6d694b.pdf
    • http://artruism.org/uploads/1/3/0/6/130620176/702828.pdf
    • http://reva.solutions/uploads/1/3/0/2/130287936/wadetumigodubijeto.pdf
    • http://andreserpoosh.com/uploads/1/3/1/3/131380183/4445873.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006e8a.bin
37905e3af07f3e809d694c610dafb86cc808bf3d18edcaa0ac17004af60dfb49		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E8A 8216 bytes
font_01_sfnt_off00008ca2.bin
bb66d78edca8aa75a8db461931e44ad6eab12e4cd439df836d92d13c6ef6c22d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8CA2 2668 bytes
font_02_sfnt_off0000960b.bin
b1fd7c28435cb9e76c94ffaaf07f6947e6fdfd7efb454b5e38ecaa20f33ebb1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x960B 16436 bytes

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