Malicious PDF — malware analysis report

Static analysis result for SHA-256 21e94e8dc88ef928…

MALICIOUS

PDF

40.3 KB Created: 2020-04-09 15:42:04 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: fb7742da7abe183e7723717cec737d08 SHA-1: 9898936a1ad57368748b160f666ca9ef3b24d23a SHA-256: 21e94e8dc88ef9287acfd7db897b4fa701ea8a3e6c37e4f04f4565620513d2f9
94 Risk Score

Malware Insights

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

The PDF file 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 primary attack pattern observed is the creation of a link farm, likely to manipulate search engine results or to distribute further malicious content via the linked PDFs.

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://godbodfitness.com/uploads/1/3/0/2/130271035/130271035.html#ib+math+studies+ia+correlation
    • http://simanpower.com/uploads/1/3/0/2/130273907/e2ee89c10a8c.pdf
    • http://crm-advisors.com/uploads/1/3/0/3/130312964/8838853.pdf
    • http://probuscurrimundi.com/uploads/1/3/0/7/130775150/rixibevone.pdf
    • http://elisewatness.com/uploads/1/3/1/4/131407836/1615085.pdf
    • http://grandviewmedicalclinic.com/uploads/1/3/0/2/130270790/tejaxonofur-febeju-gunetel.pdf
    • http://angelsequinerescue.com/uploads/1/3/1/1/131163559/605ae.pdf
    • http://greenvillemaid.com/uploads/1/3/0/7/130775808/1603500.pdf
    • http://protecaoddos.net/uploads/1/3/0/6/130621048/muteboxizuzadewadot.pdf
    • http://jahservicios.es/uploads/1/3/0/6/130639192/sepemo.pdf
    • http://thelunchbox.biz/uploads/1/3/0/5/130588987/5862981.pdf
    • http://ferrona.com/uploads/1/3/0/6/130604590/7310211.pdf
    • http://blacktiebartendersllc.com/uploads/1/3/0/5/130543979/1168c01f6.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_off0000755e.bin
153e360d756c0cc2d514c232c58c65ddb2e16c9183d7a4890b832b01e522d5d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x755E 8080 bytes

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