Malicious PDF — malware analysis report

Static analysis result for SHA-256 05b42465b9b62bd1…

MALICIOUS

PDF

34.6 KB Created: 2020-04-04 05:48:10 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d2c903bc05651591338706e8f775c7cf SHA-1: a97adc848923c9f77da1be1dc813a56ab2f78f01 SHA-256: 05b42465b9b62bd117dc47f1375f25482cc298179f3d15c4a9769f40bee9b004
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, many of which point to similarly structured URLs on different domains. This behavior is indicative of a link farm or a mechanism to distribute malicious content across multiple sites. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent. No scripts were extracted, but the sheer volume of external links suggests a coordinated effort to redirect users to potentially harmful destinations.

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://cabinetcp.com/uploads/1/3/0/2/130291328/130291328.html#navien+error+code+110+how+to+fix
    • http://printitbrandit.net/uploads/1/3/1/1/131163983/8183755.pdf
    • http://shrinesearch.com/uploads/1/3/0/5/130590164/fugisoseza.pdf
    • http://phillybedandbreakfast.com/uploads/1/3/0/5/130543537/308e2ba0962.pdf
    • http://edsl-france.fr/uploads/1/3/0/5/130541443/8661329.pdf
    • http://essencenz.co/uploads/1/3/0/4/130483625/1124968.pdf
    • http://aplusimmigration.com/uploads/1/3/0/6/130639665/cb21188a82.pdf
    • http://rabunlakestrading.com/uploads/1/3/1/4/131407877/511523.pdf
    • http://whitebuffalotransportcomll.net/uploads/1/3/0/9/130969757/fanetiroromuzozive.pdf
    • http://coylitzer.com/uploads/1/3/0/4/130478609/5253739.pdf
    • http://bodyelementmassage.com/uploads/1/3/0/6/130621485/6684126.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_off00005ed2.bin
848c48995c0d78c8531f7a1a36630eac93d7b03f06d5b902ff600032ed970cad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5ED2 7416 bytes

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