Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4911985f9de5066…

MALICIOUS

PDF

29.3 KB Created: 2020-04-19 00:31:20 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d79aad75f5675e6c2d81b455bd7cb69a SHA-1: d09ec799bdf4e20ae3801daa8e998b3ce73815de SHA-256: b4911985f9de5066ca7f9c01bc3280fe432ae97e6f5077a876ed792074b28af3
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains URLs that are also present in the heuristic findings. The primary attack pattern appears to be directing users to a link farm, likely to host further malicious content or for SEO manipulation.

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://slbconsultingservices.com/uploads/1/3/1/0/131070490/131070490.html#antelope+audio+pure+2+manual
    • http://deltonawellness.com/uploads/1/3/1/3/131398526/rulukujivuze_vupova_mepulunod_rozifobowakiw.pdf
    • http://starkmedia.services/uploads/1/3/0/8/130874261/6271281.pdf
    • http://affordablewebshop.com/uploads/1/3/0/8/130874517/fe49463bacb89.pdf
    • http://darraghbrowne.com/uploads/1/3/1/4/131482963/bekemizat.pdf
    • http://talithawashington.info/uploads/1/3/0/8/130815140/lebexu.pdf
    • http://myfoodobservatory.com/uploads/1/3/0/7/130775180/f3634f.pdf
    • http://thayhung.com/uploads/1/3/0/2/130287454/vujimadix_kelon_lezeju_rumir.pdf
    • http://ctepropertysolutions.net/uploads/1/3/0/4/130488416/nugenido_pumut_wedikadovodup.pdf
    • http://prose-by-any-other-name.com/uploads/1/3/1/4/131406560/8320182.pdf
    • http://rooticine.com/uploads/1/3/0/5/130539992/vagimajoruniluzeligi.pdf
    • http://ruigao710.com/uploads/1/3/0/5/130590463/ruxedegove_wepexod.pdf
    • http://thenavigatorproject.com/uploads/1/3/1/4/131437092/9583917.pdf
    • http://thecurlwhispererchi.com/uploads/1/3/0/2/130273735/bujetatomu-torozipi-fagigunajebe-lizovolopofo.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_off00004d06.bin
392fd3ea23b3ad4c040ee6e8c37146d82f73e3fa7770d2d3183471ab79550714		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D06 6624 bytes

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