Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffb7e9e13f54382c…

MALICIOUS

PDF

36.0 KB Created: 2020-04-20 12:55:34 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: edf8270f6b7386df4cc72e805b0e7906 SHA-1: 36a44844f281df0afbb9e41bc7322c2e75a238e1 SHA-256: ffb7e9e13f54382cbad0e4308f2b1746e87419729adef967e75a834a5f562cd9
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML classifier also flagged this PDF as malicious with a high probability. The embedded URLs suggest a link farm or SEO manipulation tactic, potentially leading to malicious content distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9867

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://thehnossaproject.com/uploads/1/3/0/4/130436483/130436483.html#accouchement+naturel+pdf
    • http://caliber-rd.com/uploads/1/3/0/6/130639121/ae539b46914b.pdf
    • http://snefferdy.com/uploads/1/3/0/5/130551330/midutifuxuru.pdf
    • http://blacklistacademy.com/uploads/1/3/0/9/130969607/533e819f.pdf
    • http://kashkoshltd.com/uploads/1/3/0/3/130379347/344392.pdf
    • http://halleeinc.com/uploads/1/3/0/6/130604772/9c0f67c1.pdf
    • http://blackcastle-records.com/uploads/1/3/0/9/130969346/jedegunubosor.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000042c5.bin
ba70894243c473bf2978694aeee1a124b31c8f8a43912b2f648c4c935deb6f0c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x42C5 8148 bytes
font_01_sfnt_off000061b7.bin
200d38861918360c12bb6d9d60e50503e710f4e1bebb41ec3c7363efd7a2c60d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61B7 2720 bytes
font_02_sfnt_off00006b53.bin
64e669e628881c7283fba57f5ca07a7b74290768684eb3cebd31ae19ef9fa4b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B53 16596 bytes

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