Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bdedd1d31ecd302…

MALICIOUS

PDF

27.9 KB Created: 2020-05-15 16:41:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c6b246a303da3491b2c0851d5064a9c7 SHA-1: bd231f79028ebda274ca8bd04e971b262bada9e0 SHA-256: 0bdedd1d31ecd3029d43e5d5a24f08d4e026aa7b2ef24d3f181a0fb8681481a6
96 Risk Score

Malware Insights

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

The PDF file contains numerous external links, flagged as a 'PDF_SEO_LINK_FARM' heuristic. These links point to various domains, many of which appear to be part of a link farm designed to manipulate search engine results or redirect users to potentially malicious content. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the primary attack vector appears to be the distribution of links within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://amtprevention.com/uploads/1/3/0/6/130639533/130639533.html#film+bioskop+indonesia+dilan
    • http://propertyhubrealestate.com/uploads/1/3/1/6/131636906/2181228.pdf
    • http://dandlfashions.com/uploads/1/3/0/3/130324112/2926419.pdf
    • http://northamptonbluecommunity.org/uploads/1/3/0/4/130476074/7765299.pdf
    • http://runforsharks.org/uploads/1/3/0/4/130435569/2973333.pdf
    • http://4d.ee/uploads/1/3/0/5/130542866/kapupesofema.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000438a.bin
fa7dcac2d6df202acc60828fab843e0ef74d19fbd8f772049f7e9a70bae33735		 pdf-font-stream PDF embedded font (sfnt) at offset 0x438A 9816 bytes

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