Malicious PDF — malware analysis report

Static analysis result for SHA-256 0820a6e49d1d3b72…

MALICIOUS

PDF

36.2 KB Created: 2020-03-20 09:46:19 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e52ffaaf6a0fa380941132ad3854256f SHA-1: 0691f33c0aa30091bb3925764c3336f979f5a9c9 SHA-256: 0820a6e49d1d3b72dfcb8687b31a70c68d6810dc8e14fb180ac27d07d9b021cc
96 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or redirection scheme. The document body, though partially corrupted, contains text related to 'Problemas suma y resta de fracciones primaria' and references wkhtmltopdf, indicating it is likely a lure document. The embedded URLs point to various domains, likely serving as a distribution point for malicious content.

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://ajshomebakedmore.com/uploads/1/3/0/5/130545260/130545260.html#problemas+suma+y+resta+de+fracciones+primaria
    • http://sipthesencha.com/uploads/1/3/0/7/130776241/c986cd64f9.pdf
    • http://anatomyinks.com/uploads/1/3/0/5/130588501/2870557.pdf
    • http://minitechmachinery.com/uploads/1/3/0/7/130776478/486182.pdf
    • http://74-123-77-4.mgwnet.com/uploads/1/3/0/3/130379101/5d1069927.pdf
    • http://mariahsavannah.com/uploads/1/3/0/7/130776712/5260790.pdf
    • http://myfoodforthoughtwithfabs.com/uploads/1/3/0/7/130775818/ximetuji-vodiwobim-kekome-dobukidag.pdf
    • http://hostmaster.sylviashaar.nl/uploads/1/3/0/7/130775808/24da37c32e352.pdf
    • http://cpanel.brunnersqualitydecks.com/uploads/1/3/0/4/130477110/246041ee23.pdf
    • http://annachojnacka.nl/uploads/1/3/0/5/130540211/a65b18085900316.pdf
    • http://wyldelife.org/uploads/1/3/0/5/130551457/6200268.pdf
    • http://thesituationshortfilm.com/uploads/1/3/0/8/130813317/9542804.pdf
    • http://cbacreditcard.com/uploads/1/3/0/5/130543941/306db6c308.pdf
    • http://www.johannamiller.com/uploads/1/3/0/2/130288378/465d47.pdf
    • http://www.wch364.com/uploads/1/3/0/6/130621937/sixese.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_off000064b0.bin
b9b143324206b57a6b0947af6f85544fcdee5022d3d0db196256f899b4e09064		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64B0 8492 bytes

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