Malicious PDF — malware analysis report

Static analysis result for SHA-256 df22718e85e71f61…

MALICIOUS

PDF

36.2 KB Created: 2020-04-07 23:44:25 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 121d00792537f5edc8dec361bf9a5338 SHA-1: e99bf4a387567e7abee5e48ca3f28179bc4c024e SHA-256: df22718e85e71f6132b2178b9ca04ea8758cccaf7bd4ba3ed1f6bae45154511c
94 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly flagged this PDF as malicious. The document body contains text that appears to be a lure, referencing a 'biggest black book ever', and includes multiple URLs that likely lead to further malicious content or phishing pages.

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://easttexasdoula.com/uploads/1/3/0/6/130621654/130621654.html#biggest+black+book+ever
    • http://gracelinesforestbathing.com/uploads/1/3/0/6/130621460/e5cb71ce60b196.pdf
    • http://clabosier.com/uploads/1/3/0/5/130550879/raniwapizuvo_fanoxupobewugu.pdf
    • http://sustainingyourself.com/uploads/1/3/0/6/130620963/kepanida-resozevixal.pdf
    • http://longstoneadvisors.com/uploads/1/3/0/6/130621114/3550036.pdf
    • http://www.flancmanfrisch.com/uploads/1/3/0/6/130604768/926519.pdf
    • http://listmn.org/uploads/1/3/0/7/130776035/627843170b1.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_off00006300.bin
3514be3169b5b4943fa7cc5aea26b122422c1c294e05c0d5271c965a1e2d2d47		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6300 8768 bytes

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