Malicious PDF — malware analysis report

Static analysis result for SHA-256 751ec48d7b572268…

MALICIOUS

PDF

35.6 KB Created: 2020-04-26 02:22:02 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 103363c5bf22bcaa04ec05e493fb9bbb SHA-1: 89e343cb91d6a300ec9b5e4c16501f31c28ed291 SHA-256: 751ec48d7b57226847ca9cdff15d58e784c3250225c5aeba00375f568d9366b9
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, many of which are numerically or generically named, suggesting a link farm or SEO spam campaign. The document body, though partially corrupted, contains the string 'Malox fact sheet' and references the wkhtmltopdf tool, indicating it was likely generated programmatically to host these links. The primary intent appears to be directing users to a network of potentially malicious or deceptive websites.

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://openbankingforum.com/uploads/1/3/1/4/131453598/131453598.html#malox+fact+sheet
    • http://friendssafetyharborlibrary.org/uploads/1/3/1/4/131438418/gupirumek.pdf
    • http://vivianmora.com/uploads/1/3/0/5/130551202/5457189.pdf
    • http://dreamcatcherstravel.net/uploads/1/3/0/2/130270834/9292022.pdf
    • http://crescerlivrecuritiba.com/uploads/1/3/0/2/130289244/zefiwetowuzeda.pdf
    • http://safetyprofessionalgroup.com/uploads/1/3/0/7/130738790/kesumubelu.pdf
    • http://gretnabrethrenchurch.org/uploads/1/3/0/2/130289301/reziwoxofemadedali.pdf
    • http://caringangelshomeofflorida.com/uploads/1/3/1/1/131163599/74f2ef9b7b34.pdf
    • http://anamccasland.com/uploads/1/3/0/5/130551876/moboxopobaga.pdf
    • http://southdownsnutrition.com/uploads/1/3/0/4/130488811/sevuri_vilusodafuditor_gufunuso.pdf
    • http://beekeepingbook.com/uploads/1/3/1/3/131381103/dufudoj_kuferatixipif_wifilozumogidag_tatobotaxoguz.pdf
    • http://leslie.tax/uploads/1/3/0/2/130289411/damip_pisafalo_suzidizise_zuvevigoxu.pdf
    • http://anamccasland.com/uploads/1/3/0/5/130
    • 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_off00006363.bin
d0faa1b636338d5e2cdf575caf2e46951089de0fccffec2315ed49922f1a5ca2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6363 8204 bytes

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