Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ce40782df615b0f…

MALICIOUS

PDF

33.1 KB Created: 2020-06-11 17:33:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 58d644fcc5c922cca3f8d932f1669dd1 SHA-1: 2d23ec76d95872654fe7d28d6e1e7e0ab483612b SHA-256: 5ce40782df615b0f404e051d9bc59ecdfb0f900f1a2c7998da57bf213411dd38
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded links to external websites, many of which appear to be part of a link farm designed to distribute malicious content. The ML classifier strongly indicated maliciousness, and the document body, though partially corrupted, includes URLs that align with the heuristic findings. The primary attack pattern involves luring users to these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://wedumedia.us/uploads/1/3/0/8/130874205/130874205.html#free+printables+and+worksheets
    • http://rosiebeautyspa.com/uploads/1/3/0/5/130543394/5630807.pdf
    • http://istria-luxuryvillas.com/uploads/1/3/0/4/130436399/457589fd73d7.pdf
    • http://host242.powermaxusa.com/uploads/1/3/0/6/130620475/b511b845c0ef7.pdf
    • http://theaddcouple.com/uploads/1/3/1/4/131453871/sezox.pdf
    • http://comprasusashop.com/uploads/1/3/0/6/130620375/lanenanosefe.pdf
    • http://ppgreentnj1.com/uploads/1/3/0/3/130379326/df7bc7e033ef5d6.pdf
    • http://mta-sts.mx.pooprescues.com/uploads/1/3/0/6/130603894/2668841.pdf
    • http://devontyler.com/uploads/1/3/1/4/131453248/gatiwemixe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://gotonuxaxoxo.files.wordpress.com/2020/06/17894441447.pdf
    • https://wipafuvuz.files.wordpress.com/2020/06/musugerifajerogibe.pdf
    • https://xevubimeroz.files.wordpress.com/2020/06/segabu.pdf
    • https://wusetav30787413.files.wordpress.com/2020/06/disidisopojizufevoberipid.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000561d.bin
218b072ba7f534b474e321933f82494a629937c5aec033da3ba626dae1293656		 pdf-font-stream PDF embedded font (sfnt) at offset 0x561D 10312 bytes

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