Malicious PDF — malware analysis report

Static analysis result for SHA-256 a18dc099a3372b24…

MALICIOUS

PDF

35.8 KB Created: 2020-06-12 04:39:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f976b5863347ee4f927a5f5c16afb431 SHA-1: 6a5e532932d7a2dc8d4fc638fc7d04ff6d1302f2 SHA-256: a18dc099a3372b246f05d1426e52d0a77e5ca45c25703765a9d3a3e0e47eeb5b
94 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files hosted on different domains. The document body, though partially corrupted, includes a reference to 'Criminal minds episodenguide' and the authoring application 'wkhtmltopdf', suggesting a lure or disguise. The primary attack pattern involves directing users to a large number of external PDF resources, which could be used for SEO spam or to distribute further malware.

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://landsurveyorsgreybruce.com/uploads/1/3/0/8/130813592/8684176.pdf
    • http://413115825.rkfischer.com/uploads/1/3/0/3/130323930/xatexulol.pdf
    • http://87.undesirable.us/uploads/1/3/0/4/130476492/e771d2.pdf
    • http://ravencreed.com/uploads/1/3/1/3/131380397/b7d4c.pdf
    • http://mail.cirquem.com.au/uploads/1/3/1/1/131164199/3241732.pdf
    • http://altoonaapts.com/uploads/1/3/1/3/131383671/doxoburifefokanomu.pdf
    • http://nolimitz.net/uploads/1/3/1/6/131606241/mupovufokovize.pdf
    • http://mta-sts.hcomail02.greatwesternco.net/uploads/1/3/0/6/130604834/fcf061.pdf
    • http://ltp.fi/uploads/1/3/1/4/131437750/rudipifawaduk-pumetu.pdf
    • http://the-sanctum.square.site/uploads/1/3/1/8/131871674/131871674.html#criminal+minds+episodenguide
    • https://tenejokago.files.wordpress.com/2020/06/36105441260.pdf
    • https://rejutunav.files.wordpress.com/2020/06/3415000941.pdf
    • https://rebadatewi.files.wordpress.com/2020/06/gajosupusadonis.pdf
    • https://mapinazoten.files.wordpress.com/2020/06/70500203831.pdf
    • https://borafitafule.files.wordpress.com/2020/06/36431922463.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_off00005e64.bin
b80e290996df9e75968cdc90a043005400b0d178794046aa6dbce1789cfb1ae6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E64 10972 bytes

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