Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1401840b77bb9ba…

MALICIOUS

PDF

42.8 KB Created: 2020-04-12 19:50:56 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1db197a906c0b5844d5ed8625b234758 SHA-1: 0d2c5ecff95b10a580eb5334c2d0762b5f0230c8 SHA-256: e1401840b77bb9badcb77d86e2536938d5f065d9dddad1472dcea0be843c4778
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML classifier strongly indicates maliciousness. The document body, though partially corrupted, contains a URL that is also present in the list of extracted URLs, suggesting a lure to external content. The primary attack pattern involves directing users to these external resources, likely for further malicious activity.

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://the-whole-thing.com/uploads/1/3/0/8/130814855/130814855.html#ejercicios+de+metodo+simplex+de+programacion+lineal
    • http://women-of-god.org/uploads/1/3/0/3/130324340/f66dd0755e16b.pdf
    • http://jackigang.com/uploads/1/3/0/4/130490338/jigogajutinefivo.pdf
    • http://michaelholt.ca/uploads/1/3/0/8/130873915/ziwafawilefijoni.pdf
    • http://citisecurities.in/uploads/1/3/0/7/130739294/gozofiz_lopiso.pdf
    • http://kzonesba.com/uploads/1/3/0/6/130640018/wowarurajune.pdf
    • http://shortpumpfarm.com/uploads/1/3/0/7/130775001/dac16d4.pdf
    • http://jldwireless.com/uploads/1/3/1/6/131607703/c0becd8866b.pdf
    • http://katsameliasbridalboutique.com/uploads/1/3/0/4/130483191/3161077.pdf
    • http://mrcameronteachingweeby.com/uploads/1/3/1/4/131483031/tivux_vavopipifab.pdf
    • http://millennialtraveleats.com/uploads/1/3/0/6/130620667/2224100.pdf
    • http://kingdomlawncare.org/uploads/1/3/0/6/130639027/wivikal_bijotefufo_xiwujal_bikusuviwunawaz.pdf
    • http://millennialtraveleats.com/uploads/
    • 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_off00007d82.bin
69c8cc5a43449349f6ff6ef551279a30d379187178e65f59b30088f177d9b671		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D82 8636 bytes

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