Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbbcaa17f4a83d6b…

MALICIOUS

PDF

41.7 KB Created: 2020-04-08 05:31:06 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f8db4c2776f0584f8927dc77036f2554 SHA-1: 120bf69b512783258137f0b03af26a8a92ddf545 SHA-256: dbbcaa17f4a83d6b83cc4911fd90a290217de097eb1f98d5c99c397686f433af
94 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML classifier also strongly indicated maliciousness. The document body contains a title in Spanish and embedded URLs, suggesting a lure to a link farm designed to manipulate search engine results or distribute malicious content. The primary attack pattern involves directing users to a network of external PDF files.

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://ne-surgerycenter.net/uploads/1/3/0/6/130639270/130639270.html#que+tipos+de+grupos+juveniles+existen+en+mexico
    • http://deltabravoconsulting.com/uploads/1/3/1/4/131408172/699d2.pdf
    • http://unitedhomeinspectionservicesinc.com/uploads/1/3/0/3/130313376/zabakuvudajaroxilupo.pdf
    • http://tholmason.com/uploads/1/3/0/6/130621794/f3893b77c.pdf
    • http://liadosangennarofesta.com/uploads/1/3/0/9/130969658/5bd1d5f.pdf
    • http://spartansinglewoodwolves.com/uploads/1/3/0/4/130477882/964460798d937.pdf
    • http://fredrickgibson.com/uploads/1/3/0/7/130739878/sojiderum.pdf
    • http://premiermdstaff.org/uploads/1/3/0/4/130436207/mejejubusuxire.pdf
    • http://warriorbodyblitz.com/uploads/1/3/1/3/131379012/4979410.pdf
    • http://artcoven.com/uploads/1/3/0/4/130435888/9522305.pdf
    • http://belitzacontreras-deleon.com/uploads/1/3/0/2/130289222/3783383.pdf
    • http://thatsnotwhatiordered.site/uploads/1/3/0/2/130272356/tipadugivelov-busilisinidogid-vawali-vaxajexome.pdf
    • http://palmettoquant.org/uploads/1/3/0/2/130288579/mazojeken-doxixebifi.pdf
    • http://mckinneypaintingservice.com/uploads/1/3/0/4/130483741/de141ae2.pdf
    • http://publicrelationsuae.com/uploads/1/3/0/7/130739165/8bb05.pdf
    • http://suessecretgarden.mobi/uploads/1/3/0/4/130435717/terixibug.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_off0000780f.bin
85096704bca8ed9013699503859d324b9e20308bcf4d86946332a9b29e7d682c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x780F 8676 bytes

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