Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d82b139dc85200b…

MALICIOUS

PDF

37.4 KB Created: 2020-04-02 10:54:03 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f00b2125efd2c430816766eb562dd9fc SHA-1: 2bbf6f0fb704f5b5198fd949ec250f6ad1be93be SHA-256: 0d82b139dc85200bd7ae0e30610dc28bdf910de2c5f83f205c3a3bf95f9e41cf
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, many of which point to other PDF files hosted on various domains. This behavior is indicative of a link farm or a distribution mechanism for malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent. No scripts were extracted, but the sheer volume of external links suggests a coordinated effort to direct users to potentially harmful resources.

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://irieint.com/uploads/1/3/0/6/130604770/130604770.html#como+redactar+una+hipotesis+de+tesis
    • http://saraandreahoffman.com/uploads/1/3/0/6/130620594/f4dd2064.pdf
    • http://gbayelectric.ca/uploads/1/3/0/6/130639743/gusegu.pdf
    • http://drjeanluc.com/uploads/1/3/0/7/130739093/8376018.pdf
    • http://rmcofcc.com/uploads/1/3/1/3/131383607/1315938.pdf
    • http://spankezone.com/uploads/1/3/0/5/130546538/wagaxo_fexororogilef_vatasup_tojezaxum.pdf
    • http://kpolandphoto.com/uploads/1/3/0/9/130969671/dugasegutuzakaduwa.pdf
    • http://roadweasles.com/uploads/1/3/0/4/130476502/1dd2a6d9b8ce6.pdf
    • http://chytryreport.cz/uploads/1/3/0/5/130547078/movapibikusoni.pdf
    • http://ygautos.com/uploads/1/3/0/9/130969404/8716434.pdf
    • http://natalyaz.com/uploads/1/3/0/7/130739234/4459362.pdf
    • http://hexagonsouth.com/uploads/1/3/0/6/130640044/1d3c61732a4d.pdf
    • http://bringyourblackexcellence.com/uploads/1/3/0/5/130588336/vodona.pdf
    • http://zackfrench.com/uploads/1/3/1/1/131164398/dexemavogug.pdf
    • http://gillianreynolds.com/uploads/1/3/0/9/130969826/f25d623a0.pdf
    • http://health-and-life-awareness.org/uploads/1/3/1/3/131397989/69a46a.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_off0000682a.bin
7b4537d12ba8dedbf9ccf581d1b8d7d0e5be76e9f6872a72866248a128900670		 pdf-font-stream PDF embedded font (sfnt) at offset 0x682A 8380 bytes

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