Malicious PDF — malware analysis report

Static analysis result for SHA-256 0651e3383d897137…

MALICIOUS

PDF

38.3 KB Created: 2020-04-06 07:37:48 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e96116570a76e8098b85eddbeecc0949 SHA-1: 34d72bf277a82b2ee557aafc53a44f1a6ae3e456 SHA-256: 0651e3383d897137e029d36ea464ab47d5afadf5e2931e1a604f2f721f0769bd
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

The PDF contains a large number of external links to other PDF files hosted on various domains, indicating a link farm or a distribution network. The ML classifier strongly flagged this PDF as malicious, and the heuristic firings confirm the presence of a mass external PDF link farm. The embedded URLs suggest an attempt to direct users to potentially malicious content or to manipulate search engine rankings.

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://frankyjay.net/uploads/1/3/0/6/130620962/130620962.html#resumen+de+la+historia+del+derecho+laboral+en+el+salvador
    • http://europeanstudy.eu/uploads/1/3/0/9/130969419/janorogizigawij_jibotonep.pdf
    • http://hirainstitute.net/uploads/1/3/0/5/130546457/9675253.pdf
    • http://mohamoudegal.com/uploads/1/3/1/4/131438517/zobidapog.pdf
    • http://2016shadowcampaignthemovie.com/uploads/1/3/0/4/130490928/budov_kunotixuk_rimolop_benufiximimos.pdf
    • http://thecozyrustic.com/uploads/1/3/0/4/130488470/warazik.pdf
    • http://prepsense.com/uploads/1/3/0/8/130874614/2154588.pdf
    • http://my-dpm.org/uploads/1/3/0/8/130813945/ravumi.pdf
    • http://connectionsathome.net/uploads/1/3/0/6/130603684/3848540823d28a.pdf
    • http://nailsbyrose.nl/uploads/1/3/0/7/130740196/e6384.pdf
    • http://allbrightcompany.com/uploads/1/3/1/0/131071037/897320.pdf
    • http://fontawesome.iohttp://fontawesome.io/license/
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006573.bin
7d0e4f26927737c593ed7efda103a1107150fe3ac8ddbcafaf6ee6c0af50a0b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6573 1588 bytes
font_01_sfnt_off00006d28.bin
9f6b6e7d8ce4a9e628ee0954ffadda3cb13509a4242c216ae92b729ff7edc75a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D28 8304 bytes

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