Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b25f2a5bc1f95cf…

MALICIOUS

PDF

38.3 KB Created: 2020-06-16 23:19:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 02615946a3653095435d2c72c2b4e4e3 SHA-1: e0a7810678414fe5489c631dd3caafabecd95442 SHA-256: 5b25f2a5bc1f95cf3b07e4abc803b3d92a711c0d28fddd81cff8a337ce72c906
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, a technique often used for SEO spam or to redirect users to malicious sites. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a mass external link farm. While no scripts were explicitly extracted, the nature of the embedded links suggests a potential for JavaScript execution or redirection to exploit kits.

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://photosbyrachael.com/uploads/1/3/1/0/131070845/131070845.html#hadouken+dance+lessons
    • http://dedagvanhetevenement.nl/uploads/1/3/0/3/130312972/vimapabunupeg.pdf
    • http://unitadintento.com/uploads/1/3/1/8/131856641/6d9043cc51854ca.pdf
    • http://150ecrossroads.com/uploads/1/3/0/6/130605263/2032229.pdf
    • http://dallascouplesdoc.aimeetanos.com/uploads/1/3/0/6/130604576/1b586888.pdf
    • http://matsbalko.se/uploads/1/3/0/3/130380037/e7edc3f17ef.pdf
    • http://mypmartin.com/uploads/1/3/0/5/130550901/b470299e2.pdf
    • http://specialkidcare.org/uploads/1/3/0/5/130588780/varosoxejipapate.pdf
    • http://autoaccidentlawyerswtl.com/uploads/1/3/0/6/130622077/6568137.pdf
    • http://mail.crushthemarket.com/uploads/1/3/0/2/130289189/933c2575bdacd7f.pdf
    • http://mail.sebolt.com/uploads/1/3/0/2/130288394/3555908.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005894.bin
3fbd2137b13a0cd1743a11c3a548a66a74662cdaec4b17cfeade9ec3aa11c9d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5894 4616 bytes
font_01_sfnt_off00006845.bin
a438b6b60007013c5bf7ed16397c6399275c6a37e03ee2b62fda17346b81c5df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6845 11352 bytes

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