Malicious PDF — malware analysis report

Static analysis result for SHA-256 f855f12b9bfb396d…

MALICIOUS

PDF

39.3 KB Created: 2020-04-02 04:28:27 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d60d574ecb3d125e0cef3450e6b23391 SHA-1: e0acc492a7c156b0b4a59475b7ff5bfc06ee2050 SHA-256: f855f12b9bfb396df5f6e81079c85507ea54862bd3c5f423e8f390c8a01ad9e0
94 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of SEO spam or phishing by linking to a large number of external PDF documents hosted on various domains. The document body, though partially corrupted, contains text related to a 'diagnostic interview in mental health' and includes a URL that mirrors this theme. The ML classifier strongly indicates maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a link farm, suggesting an attempt to manipulate search engine results or direct users to potentially harmful 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://wwwdaimondholiday.com/uploads/1/3/0/6/130620401/130620401.html#entrevista+diagnostica+en+salud+mental
    • http://lauravalentina.es/uploads/1/3/0/6/130605036/gomenu.pdf
    • http://1000breath.com/uploads/1/3/0/5/130588769/meluvesojin_galuz.pdf
    • http://planninginblackandwhite.com/uploads/1/3/0/6/130640052/95c508d11313ecc.pdf
    • http://teachingsm.com/uploads/1/3/0/6/130639397/rerifigitoje.pdf
    • http://roaringforkbiomass.org/uploads/1/3/0/9/130969682/futonifukawopi-diwirisokajiwag-ravenejafapibu.pdf
    • http://allwestindustries.com/uploads/1/3/1/0/131070751/gukigonub_fidifebufiwek_difakev_sawux.pdf
    • http://lotsofusedbooks.com/uploads/1/3/0/7/130739926/fuvovojomozazale.pdf
    • http://lvapparel.net/uploads/1/3/0/8/130873893/499972.pdf
    • http://milnebayorganics.com/uploads/1/3/0/3/130380037/vewenop.pdf
    • http://straightforwardchirocare.acupuncturevegas.com/uploads/1/3/1/1/131163962/xozerosu.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_off00006ef5.bin
9f1aef6a83c8f01ac8a54f3ae7373e4f422e738c19271b183fccacd91c44c08a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EF5 8700 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.