Malicious PDF — malware analysis report

Static analysis result for SHA-256 54ea784fb5baec8a…

MALICIOUS

PDF

43.9 KB Created: 2020-03-29 12:16:02 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ed69bb9356afa1cef87d78fa0dc58805 SHA-1: f961d87442de430baa7a580efddd455e14054b5a SHA-256: 54ea784fb5baec8a4a6bdc9904e7a4354d6e96eb91dfbe080e34c0a724ee3318
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of external links to various domains, as indicated by the PDF_SEO_LINK_FARM heuristic. The document body text, though partially corrupted, suggests a lure related to 'informe de practicas pedagogicas' (pedagogical practice report). The primary attack pattern appears to be a link farm designed to manipulate search engine results or redirect users to potentially malicious content hosted on numerous subdomains.

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://iweargreatness.com/uploads/1/3/0/6/130620521/130620521.html#como+hacer+un+informe+de+practicas+pedagogicas
    • http://milonemarco.com/uploads/1/3/0/6/130622009/6584653.pdf
    • http://tratamientointegral.net/uploads/1/3/0/6/130639107/fuvofazeso_zuwemisut.pdf
    • http://ikigaiplace.com/uploads/1/3/0/2/130289240/pebafawinerekameti.pdf
    • http://rowandesigngroup.net/uploads/1/3/0/4/130436079/2197274.pdf
    • http://the3millefioris.com/uploads/1/3/0/4/130478123/desavi.pdf
    • http://theacneandskincareclinic.com/uploads/1/3/1/3/131380951/affc04523c.pdf
    • http://tijuanadragones.com/uploads/1/3/0/8/130814529/60dad0eee61c.pdf
    • http://boisehomeinspections.services/uploads/1/3/0/3/130313262/nivivejudures-zujofurigirux-mixupujutepen.pdf
    • http://larashennib.com/uploads/1/3/0/7/130738641/towubisunid_vokubodesotobe_jemonufewamekog_ginil.pdf
    • http://newdigategoodneighbours.org/uploads/1/3/0/5/130588164/sigekejom_gaxube_rewalewekenujav.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_off0000804b.bin
fd1bb77fe513e44bed5e3a40481a17dee46d9ec633937077bb3138182c8a779c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x804B 8984 bytes

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