Malicious PDF — malware analysis report

Static analysis result for SHA-256 6789ac091a539a50…

MALICIOUS

PDF

35.4 KB Created: 2020-04-08 20:47:09 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 551c82ab43b89bfc042dfbc56dd7c0f9 SHA-1: c5dd4e0008c6bdbe90c89d32a808e80a3aa8b206 SHA-256: 6789ac091a539a50c4c5aa3e6ae7eee2d90e3294bad97ea6d318ced6f0615ba6
96 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a link farm, embedding a large number of external URLs. The heuristic 'PDF_SEO_LINK_FARM' specifically flags this behavior, indicating a potential attempt to manipulate search engine results or redirect users to malicious content. The ML classifier also strongly indicated maliciousness, supporting the assessment that the embedded links are the primary attack vector.

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://blackbabiesmatter.org/uploads/1/3/0/2/130289570/130289570.html#cornell+note+taking+template+for+ipad
    • http://dotnetcourses.ca/uploads/1/3/0/6/130603865/5627864998.pdf
    • http://bluegrassbnb.com/uploads/1/3/0/7/130775682/josogamizetu.pdf
    • http://rep-christ.com/uploads/1/3/1/4/131438528/bdcfdfd7292.pdf
    • http://clevelandjerseyframing.com/uploads/1/3/1/0/131071243/muxoti-rimodavexoz-kusid-dibesexet.pdf
    • http://beachclubproductions.net/uploads/1/3/0/5/130590778/5509626.pdf
    • http://dafyjor.store/uploads/1/3/0/7/130740376/a37542.pdf
    • http://mikewilliamsmusicclasses.com/uploads/1/3/0/7/130775985/dewukaji-zamotiwopifiru-fetuni.pdf
    • http://e-wco.com/uploads/1/3/0/2/130287493/942724.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_off00006267.bin
e32431c868f78176a5de727ba1c310b1736674a5d6a70b30d8387a81a0375be4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6267 7876 bytes

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