Malicious PDF — malware analysis report

Static analysis result for SHA-256 99308506dc73f099…

MALICIOUS

PDF

45.4 KB Created: 2020-06-22 10:47:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1bce8d8d1307fd1d4db48bf1ed4bbbe4 SHA-1: 11920b2debd90a27450ae4eb025e04223dd713ac SHA-256: 99308506dc73f0995c1b98dff987fdfc88d02514dfd2e4df13ae325eb2add7d8
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various PDF files hosted on different domains, suggesting a link farm or distribution mechanism for further malicious content. The ML_NYX_PDF_MALICIOUS heuristic also flagged this file with high confidence. No scripts were extracted from this sample.

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://hostmaster.mosbespokecakes.co.uk/uploads/1/3/0/9/130969980/130969980.html#led+display+pdf
    • http://bodiesbygrady.com/uploads/1/3/1/3/131379612/fapawug.pdf
    • http://2121secr.com/uploads/1/3/0/7/130740616/rotim.pdf
    • http://hostmaster.michaelfoyle.org/uploads/1/3/0/5/130588740/859078a7206b.pdf
    • http://mjsurveyllc.com/uploads/1/3/0/5/130541552/vibopakuxul.pdf
    • http://doubleheartsoapcompany.com/uploads/1/3/0/3/130312952/2612be8f6ac7.pdf
    • http://msgarletts-hancock.com/uploads/1/3/0/2/130272613/665ffd50e.pdf
    • http://offshore-aviation.com/uploads/1/3/1/3/131398368/vavefeberuto.pdf
    • http://lizzyridge.com/uploads/1/3/1/8/131856293/0483c3ca.pdf
    • http://lookingforaneventure.com/uploads/1/3/0/4/130435745/9a6fd.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000075bd.bin
ffb4632708dd60099dd2a89f03111eb9a26a75183c601c4b39b7bd7eed7da204		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75BD 4476 bytes
font_01_sfnt_off000084fa.bin
2e4ec24095d71c75fcb82c3c4a788f3fc6426b55048a9547ea7468b9118c9f3a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84FA 10848 bytes

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