Malicious PDF — malware analysis report

Static analysis result for SHA-256 38d0c9b147001fbc…

MALICIOUS

PDF

31.6 KB Created: 2020-04-07 23:44:48 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0c8c66db9af68bc4230ad2a9a780239a SHA-1: c6c99e16fa19614bd171e3861c0ccf29003905ca SHA-256: 38d0c9b147001fbc1a0c0f4bf67be8c672b838b4a9c8f50bb4d6d267571280fc
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links to SEO-optimized PDF files hosted on various domains. This pattern is indicative of a link farm designed to manipulate search engine rankings or distribute malicious content. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted, but the extensive use of external links suggests a redirection or content-loading mechanism.

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://jkfosterlaw.com/uploads/1/3/1/4/131483318/131483318.html#tabla+de+numeros+aleatorios+para+muestreo+pdf
    • http://ydevents.org/uploads/1/3/1/3/131398429/3229327.pdf
    • http://fibroflute.com/uploads/1/3/0/7/130740477/6894917.pdf
    • http://uncoursdamour.com/uploads/1/3/0/5/130551057/sinobar-nonipezudogom-kabisowatujenis-ravanofomosokax.pdf
    • http://portlandboutique.net/uploads/1/3/1/1/131163684/df5ce69ed727fda.pdf
    • http://lifecoachservices.net/uploads/1/3/0/6/130604477/3573916.pdf
    • http://indianapolisstumpremoval.com/uploads/1/3/0/3/130379164/a833b262c169.pdf
    • http://kelleycarney.com/uploads/1/3/0/3/130313024/lepag_xerejodabibape_dipigixoli.pdf
    • http://shoryukenramen.com/uploads/1/3/0/3/130313741/baperaje-mekereveweripi.pdf
    • http://oursecret.hu/uploads/1/3/0/7/130740376/xurosata.pdf
    • http://gadnadlan.com/uploads/1/3/0/4/130488299/getosudederosofove.pdf
    • http://endlessseasonfarms.com/uploads/1/3/0/7/130738629/padajovametogagev.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_off000052fb.bin
c67533c56f897769f258ac056bbac067cb43a999ab992922626fe113602c7ee1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x52FB 7616 bytes

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