Malicious PDF — malware analysis report

Static analysis result for SHA-256 f69e52059dda8d5c…

MALICIOUS

PDF

47.4 KB Created: 2020-04-16 23:43:04 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e2a3cb3db06b88a936c842c23b4e1fb4 SHA-1: fbf173ab74e0f676623175e79740127a7ab4d38c SHA-256: f69e52059dda8d5c7bc7d8e7e7ceecff679f8d90424f84b80cfbb7a7bab205ab
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a large number of external links to other PDF files hosted on various domains, indicating a link farm or redirection strategy. The ML classifier strongly flagged this PDF as malicious. The presence of numerous numeric-slugged PDF links suggests an attempt to create SEO-optimized content to lure unsuspecting users to potentially malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://wagnerwagyu.com/uploads/1/3/1/4/131436971/131436971.html#amoksisilin+klavulanik+asit+pdf
    • http://u2.technology/uploads/1/3/0/5/130551957/638375.pdf
    • http://mgfinancialsolutions.net/uploads/1/3/0/3/130323724/nufuku-nizovejozifo.pdf
    • http://peterpetschenig.com/uploads/1/3/0/7/130740110/kexaregeza.pdf
    • http://zhanghaoxiangart.com/uploads/1/3/0/4/130435835/3754723.pdf
    • http://deltaaviationoxygen.com/uploads/1/3/0/8/130815582/c77ab.pdf
    • http://drywallpasadena.com/uploads/1/3/0/6/130620395/xemejetupi-timapikej-bevusun-najovovirijo.pdf
    • http://bakariweddings.com/uploads/1/3/0/5/130544132/dilezebinisupoz_zagexezekum_pajidamagif_jetijomunefodi.pdf
    • http://zumbatinleypark.com/uploads/1/3/1/0/131070798/8275105.pdf
    • http://deltaaviationoxygen.com/uploads/1/3/0/8/1308
    • 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/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008fc8.bin
fbec52273f8d1d4d9a97b3b789ba4fd4fba365747582cc6555c3704882e70d4b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8FC8 10016 bytes

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