Malicious PDF — malware analysis report

Static analysis result for SHA-256 6575b41ae87e6dfb…

MALICIOUS

PDF

42.4 KB Created: 2020-04-05 03:20:07 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 6e26c011564891c4030b67a80ab2e351 SHA-1: 149d049f9a34db748d8ffb4b50755a806efcd09b SHA-256: 6575b41ae87e6dfbedc1cb4166bd4392e2d5906a2579d7ab4cc056bc69445be0
96 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs pointing to external websites, many of which appear to be part of a link farm. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a mass external link farm. While no scripts were explicitly extracted, the nature of the embedded URLs suggests an attempt to redirect users to potentially malicious content or phishing sites, aligning with a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://rabkatwojemiasto.com/uploads/1/3/0/6/130640062/130640062.html#que+es+un+cliente+externo+e+interno
    • http://darklostlovepspells.com/uploads/1/3/0/5/130588403/duwudodunudunulipida.pdf
    • http://thatsustainsme.com/uploads/1/3/0/2/130289478/gavudak-jaxabiv-jasuvofevujoke-sepujizerot.pdf
    • http://www.crepheats.com/uploads/1/3/0/6/130620627/1089423.pdf
    • http://busybeesdaycare.org/uploads/1/3/1/3/131379401/3263760.pdf
    • http://kenzeesklozet.com/uploads/1/3/1/4/131412713/bugetore.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/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000065cf.bin
82cf3e69631523b5b434055ab432a38ff21db4b9adc7cb552534e38f567e17e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65CF 9036 bytes
font_01_sfnt_off00008679.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8679 16036 bytes

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