Malicious PDF — malware analysis report

Static analysis result for SHA-256 61d07e016b971af9…

MALICIOUS

PDF

58.4 KB Created: 2020-04-11 09:08:14 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d4747648c765a4bd93b30c76d99969a8 SHA-1: e5485e2fe8954497bc7e028214f7e6da27932b60 SHA-256: 61d07e016b971af980d17307279ffe37c8744ab56e6cf9750ebd28645e636dbc
96 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which point to other PDF files hosted on similar domains. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass external link farm, suggesting a tactic to manipulate search engine results or distribute malicious content. The ML classifier also flagged this PDF as malicious with high confidence. While no scripts were directly extracted, the structure and numerous external links strongly suggest a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9855

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://djsacademy.com/uploads/1/3/0/4/130483617/130483617.html#ge+cl3+universal+remote+manual
    • http://okmissionhall.com/uploads/1/3/0/3/130379118/b6e5f212e70cc.pdf
    • http://lnccanada.org/uploads/1/3/1/4/131454719/jepixoxizumoxona.pdf
    • http://rjhomecontractor.com/uploads/1/3/1/4/131453027/4b5e7757ea368.pdf
    • http://liftuplabs.com/uploads/1/3/1/1/131163599/gezinoxejepig_poxukuridawuj.pdf
    • http://lucylilian.com/uploads/1/3/0/2/130287815/3134875.pdf
    • http://akronautotowing.com/uploads/1/3/0/6/130604701/5631064.pdf
    • http://bearam.com/uploads/1/3/0/5/130589219/6bf8ff1.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_off0000bf58.bin
588343ccf240f7800c185fc952c4491082b5b3533ffed8e6061a2d3636ef1241		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBF58 7920 bytes

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