Malicious PDF — malware analysis report

Static analysis result for SHA-256 42955d733c337b30…

MALICIOUS

PDF

36.2 KB Created: 2020-04-06 12:46:59 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e63713078b48e5c1f4c8a36dc0a933e2 SHA-1: b9b1e4daf1b4846490e9d4e7b826c77367b0a2e5 SHA-256: 42955d733c337b30798460e451b5355c12e3db5f24f81fe4071dcd76cb529ecf
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. The document body also contains a URL that appears to be a lure for downloading pirated software ('descargar pinnacle studio 21 ultimate full en español'). The ML classifier strongly flagged this PDF as malicious, indicating a high probability of malicious intent. No scripts were extracted, but the extensive link farm and lure suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://resultsmasterycoaching.net/uploads/1/3/0/6/130605393/130605393.html#descargar+pinnacle+studio+21+ultimate+full+en+espa%C3%B1ol
    • http://thehdic.com/uploads/1/3/0/7/130775129/zixefezidedizo-dawujesu.pdf
    • http://mail.newtown-ambulance.org/uploads/1/3/0/6/130639312/22e72bfb3e.pdf
    • http://jonataschimen.com/uploads/1/3/0/2/130289308/1193012.pdf
    • http://crystalobregon.net/uploads/1/3/0/6/130603773/3868bac6f71f1e.pdf
    • http://impression-sunrise.com/uploads/1/3/0/7/130776508/nowipapajabilef.pdf
    • http://amaterasutaiko.com/uploads/1/3/0/8/130814914/c8319b72a.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_off000060ee.bin
2ee3a8f91c5ecd9b037e5a2dba1ff982b9e1430e5ddcbad95c2c2ccf37c0d9ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60EE 8888 bytes

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