Malicious PDF — malware analysis report

Static analysis result for SHA-256 76ccb460707f878f…

MALICIOUS

PDF

40.4 KB Created: 2020-04-20 07:15:09 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ab91b7856dbf9993dece32c1ca748a2b SHA-1: 11a0adb78d53196cec7f16da7dc2e5bb09f92ea0 SHA-256: 76ccb460707f878fd8310812a0af1d3cd4eab0aca6b2e200b6d338a77d21838b
136 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document exhibits malicious behavior by including a large number of external links, characteristic of a link farm or SEO spam. Crucially, it contains a 'Clipboard command execution lure', instructing the user to copy and paste content into a shell, which is a common technique to trick users into executing malicious commands, likely to download and run a second-stage payload. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://zilpavandergragt-artstudio.com/uploads/1/3/1/3/131378993/131378993.html#worry+free+business+security+agent+manually+uninstall
    • http://intermodelguatemala.com/uploads/1/3/0/5/130545627/9324578.pdf
    • http://finleysfacilitiesservices.com/uploads/1/3/0/7/130775622/bab1ac5.pdf
    • http://vousetnousen2020.com/uploads/1/3/0/2/130272395/sapej-jaziwomadafas-bamutewowaxikex.pdf
    • http://mcveystransport.com/uploads/1/3/0/6/130639888/retuxej-dawiluneku.pdf
    • http://tanyatherapeutic.com/uploads/1/3/0/3/130379289/misujuxifegape_xariwisegapi_kapebekologu_ninipoje.pdf
    • http://andreaspector.pro/uploads/1/3/0/4/130476429/vofomam-wadalesegu-sukarida.pdf
    • http://gaudlaw.com/uploads/1/3/0/6/130605493/ditorexanivot-giwiwavorekupux.pdf
    • http://ourstorybarn.com/uploads/1/3/0/6/130604894/e507c7396.pdf
    • http://gloriadgray.com/uploads/1/3/0/6/130640102/didipadavo-jakak.pdf
    • http://tysoares.com/uploads/1/3/0/5/130589328/tagikemabewegojisi.pdf
    • http://fortheloveofsharks.com/uploads/1/3/0/6/130639853/1244610.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_off000075a6.bin
4c88444ad45a68dc0ae7ca5f399463397d79d10bef989411b0654fa9d4c1e459		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75A6 8180 bytes

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