Malicious PDF — malware analysis report

Static analysis result for SHA-256 f22905ff9a9b8f60…

MALICIOUS

PDF

48.7 KB Created: 2020-04-11 11:28:05 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ef894bf90a95ddae4dfa59a2e52f8aa1 SHA-1: 51451dd4d2066d31e4fd50dcf283196cdf07ced4 SHA-256: f22905ff9a9b8f600b364abcee747f84e91d1262611f148b339e9cf109ba5601
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains a large number of external links, identified as a PDF link farm. The ML classifier strongly indicates maliciousness. The document body contains text related to 'Definicion de la sociedad' and metadata indicating it was generated by wkhtmltopdf, suggesting a lure document. The primary attack pattern involves redirecting users to numerous external PDF files hosted across various 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://host37.carmichaelnl.com/uploads/1/3/1/4/131437444/131437444.html#definicion+de+la+sociedad
    • http://simplywhoopie.com/uploads/1/3/0/6/130604030/tibakop.pdf
    • http://beebear.com/uploads/1/3/0/5/130588999/ee5cdf4ba5553c.pdf
    • http://milgens.com/uploads/1/3/0/5/130539843/999558.pdf
    • http://teamtakahe.com/uploads/1/3/0/8/130814749/24205e1.pdf
    • http://andreaforgood.org/uploads/1/3/0/5/130540280/fdb1dcb395.pdf
    • http://threeonabbott.com/uploads/1/3/1/3/131383646/c563c6bda4b99.pdf
    • http://winterpeaky.com/uploads/1/3/0/8/130814718/6609693.pdf
    • http://caffconsults.com/uploads/1/3/0/5/130550690/sudimubifoxi-rexanutenok-sibaxolaxetomes.pdf
    • http://caif.eu/uploads/1/3/0/6/130639267/novoragaredeka-lobow-dubozegetonepug-vivojibuxuka.pdf
    • http://www.bigsoul.fr/uploads/1/3/0/5/130551487/1307c59.pdf
    • http://avetausa.com/uploads/1/3/0/5/130545885/pemuzavetozafijeler.pdf
    • http://monterreyparknotarypublic.com/uploads/1/3/0/5/130590058/tubinilugaberu-rizus-zoxetew.pdf
    • http://tribeofhealth.com/uploads/1/3/0/3/130323997/katewe_mudasakifofu.pdf
    • http://optimumfamilyservicesllc.net/uploads/1/3/0/8/130813364/2745899.pdf
    • http://duhameleducationinitiative.org/uploads/1/3/0/5/130589415/pitiru.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008a71.bin
0301d68cd4473ee9212f354b9237857592095b64f35cb8453fb5fc5583a838ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A71 8940 bytes
font_01_sfnt_off0000aa71.bin
59598b843c6dbbd6f844c712fc8ba0218f2c7fc8e8e5c3db32488020cf7f1801		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAA71 2852 bytes

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