Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d832519c25ac2eb…

MALICIOUS

PDF

36.8 KB Created: 2020-05-30 21:44:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e9f7446f5748c2c3c70d044ceddb7db7 SHA-1: 148393827782d8a8ac37d3155ed276ac59f9cb4f SHA-256: 7d832519c25ac2eb20c3ef638869d3913cc5450ec9a84cefce887eda008d162a
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or redirection scheme. The embedded URLs point to various domains, many of which appear to be dynamically generated or part of a content farm. The ML classifier strongly indicated maliciousness, and the overall structure points towards a malicious document designed to lead users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://busynational.com/uploads/1/3/1/8/131857565/131857565.html#markarth+enchanting+table
    • http://getitnowhotdeals.com/uploads/1/3/1/8/131871456/betekuzexaviwurip.pdf
    • http://regnaniautoaalliance.com/uploads/1/3/0/3/130323437/14316cf468.pdf
    • http://angel-psychic.com/uploads/1/3/0/6/130605016/fuxitadinagap.pdf
    • http://formal-ink.studio/uploads/1/3/1/3/131379590/ketobufad-nebuvidemami-nafifanowixozi-jekixuv.pdf
    • http://sovereignglobalaccountants.com/uploads/1/3/1/3/131379182/704548.pdf
    • http://3ew.undesirable.us/uploads/1/3/1/1/131163634/50e57746bb636.pdf
    • http://sleevestshirts.org/uploads/1/3/0/7/130776827/jovoganijivujirunuf.pdf
    • http://theevergreennest.com/uploads/1/3/0/6/130605174/vekofisapefot_sazuzolo_rakani_kovaza.pdf
    • http://lanebillingsphotography.com/uploads/1/3/0/4/130436040/7382836.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000064c1.bin
9e9fc9014d2d99724910c17c529ecd2f18655858714c17408658a83fbace04a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64C1 10216 bytes

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