Malicious PDF — malware analysis report

Static analysis result for SHA-256 66d8af2a0dc56ede…

MALICIOUS

PDF

39.8 KB Created: 2020-04-09 02:12:29 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: b7bf0820a4bee6fae86b5918a0e34d84 SHA-1: b917086041d1461a10a927060097a684202ce0b6 SHA-256: 66d8af2a0dc56ede7d1141dc054f10de653426463b5d1a27985df3e02d76528b
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous links to unrelated domains supports this finding. No scripts were extracted from this sample.

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://versatilevisionz.com/uploads/1/3/0/6/130604780/130604780.html#white+crosshair+cs+go
    • http://sarahfuchs.org/uploads/1/3/0/6/130621853/rifozokuluke.pdf
    • http://jerrysills.com/uploads/1/3/0/2/130272619/sabonuxugenekujogut.pdf
    • http://femmefatalebeauty.net/uploads/1/3/0/2/130289748/5608875.pdf
    • http://canticacanticorum.com/uploads/1/3/0/6/130621086/funufo_kobuxew_lujakutetubusa_worafelalebo.pdf
    • http://enkaytalentbeautyblog.com/uploads/1/3/0/2/130289756/lefowe-miriwipixov.pdf
    • http://bltportfolio.com/uploads/1/3/0/6/130639305/282163.pdf
    • http://vyberecords.com/uploads/1/3/0/2/130273752/558639.pdf
    • http://techniqueshonolulu.com/uploads/1/3/0/3/130379757/3139942.pdf
    • http://chelseapaigefoundation.com/uploads/1/3/0/2/130272862/bojejutafopeg-nuzulibefivukew.pdf
    • http://bloodygoodcreativeco.com/uploads/1/3/0/2/130272094/2930963.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_off000070c1.bin
81057664c64c53ef23635fbb25155d80e92988185bb7fdd2b061f0352dbff1d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70C1 9048 bytes

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