Malicious PDF — malware analysis report

Static analysis result for SHA-256 16be4297e95a61ee…

MALICIOUS

PDF

44.3 KB Created: 2020-04-19 23:21:42 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c764bc02bbd5b25b5217b7b100d4bf70 SHA-1: da2a35f140cdd64e0482e2e957d7169a93c229ee SHA-256: 16be4297e95a61eeaf9e5f1bf433ecbebc263070d87b53e74f93f36a6c65125e
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document exhibits malicious behavior by attempting to lure the user with a 'free antivirus for Mac' theme and instructing them to disable security software. It contains a large number of embedded links to external PDF files, likely for SEO manipulation or to host further malicious content. The ML classifier strongly indicated maliciousness, and the presence of numerous external links suggests a coordinated effort to distribute malicious content or traffic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://moodlabnewlife.nl/uploads/1/3/0/6/130621194/130621194.html#antivirus+gratis+mac
    • http://washtenawcountyhomeinspector.com/uploads/1/3/0/5/130551001/zagumeror-lamas-finudululasopo.pdf
    • http://youtubevideoscreation.com/uploads/1/3/1/3/131380397/2c05207f.pdf
    • http://brandmarketingconsultancy.com/uploads/1/3/0/7/130739094/zojajaxugik-vukawig-dotujababodiro.pdf
    • http://wheretheriverfrowns.com/uploads/1/3/1/6/131606057/1392098.pdf
    • http://constructionminutie.com/uploads/1/3/1/3/131397927/781d190c0ab5.pdf
    • http://lazyattack.net/uploads/1/3/1/4/131437349/7629289.pdf
    • http://ecosattvasangha.com/uploads/1/3/0/5/130588923/faketarufowede.pdf
    • http://ntxsportswear.com/uploads/1/3/1/3/131380063/1c6244a24.pdf
    • http://whatwouldarthursay.com/uploads/1/3/1/3/131384013/bejedafarulo_zenal.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_off000084b8.bin
4673d0db84067ef6d7a228fd3a25b0962647983cf1cc82459e9c01f4a7379418		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84B8 9164 bytes

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