Malicious PDF — malware analysis report

Static analysis result for SHA-256 13a623de1d693797…

MALICIOUS

PDF

39.1 KB Created: 2020-04-17 09:53:31 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 7483b941b60a1406578e84045f113fb8 SHA-1: 5a95045d6129cedc7aabcee5a59de36a08cca45f SHA-256: 13a623de1d6937977ee489eac6912e5b89221f712d358872c3ee59f3a3907044
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, identified as a 'link farm' by heuristics, suggesting a deceptive purpose. The ML classifier strongly indicates maliciousness. The embedded URLs point to various domains, likely serving as a distribution mechanism for further malicious content or SEO spam. No scripts were extracted, but the PDF structure itself is used to host and link to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://baileysforher.com/uploads/1/3/0/8/130813781/130813781.html#earthing+sheet+washing+instructions
    • http://tckprosjekt.smartkomweb.no/uploads/1/3/0/7/130775393/demexuvunojilu.pdf
    • http://breathebrogan.com/uploads/1/3/0/2/130288630/ee525af5c.pdf
    • http://redfactoryaustralia.com/uploads/1/3/0/6/130620345/aefa1eb96bb0d.pdf
    • http://nancyporterchiropractice.com/uploads/1/3/0/6/130621717/fenomodoz.pdf
    • http://costamedicalmarijuana.com/uploads/1/3/0/7/130740258/a3275d346.pdf
    • http://acnibo.org/uploads/1/3/1/6/131637054/wurubevasel.pdf
    • http://hassle-free-cleaning.com/uploads/1/3/1/4/131409135/5551482.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_off000070f5.bin
09441a3ebaa4ebc7ae6807ebc7bdf7b7eedc77d8a2e1c295df0b7beb24c18593		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70F5 8216 bytes

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