Malicious PDF — malware analysis report

Static analysis result for SHA-256 68affdc2336de2e5…

MALICIOUS

PDF

99.4 KB Created: 2020-04-12 11:51:20 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 7199d52d854e0dd3448e6d7484c07946 SHA-1: d3a502c157bc9ae085cfd763cc103f9ec8a76b24 SHA-256: 68affdc2336de2e522a413f48c8b99ea69e4a50d92fdbc361ac43200392ed37a
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links to other PDF files hosted on various domains, indicative of a link farm. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to potentially malicious content or for SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://epicliving.rocks/uploads/1/3/0/5/130551125/130551125.html#libro+para+el+maestro+espa%C3%B1ol+primer+grado+1993+pdf
    • http://runmurrysville.org/uploads/1/3/1/4/131453330/8866334.pdf
    • http://mandywhiteceramics.com/uploads/1/3/0/8/130814208/lalidemi_fupokujelovota_dabaniluzat.pdf
    • http://footballfusionfc.com/uploads/1/3/0/2/130288709/nipeliveta.pdf
    • http://detailpoint.nl/uploads/1/3/0/7/130739362/6148509.pdf
    • http://quandocasei.com/uploads/1/3/0/6/130620948/ligejojevupudid-wapefadol-jumatoji.pdf
    • http://heartfelthabitat.com/uploads/1/3/0/6/130621084/6424e.pdf
    • http://dirtylilkidz.com/uploads/1/3/0/6/130639809/f932de67a2.pdf
    • http://aascustomjeep.com/uploads/1/3/0/4/130483041/5262239.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_off00015a21.bin
7292ce9d162f5baacc1268c0c8d8a68ee21c3a37ad8b96fd3d61b5d10903a7d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15A21 10552 bytes

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