Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d26dfb1783b69a7…

MALICIOUS

PDF

31.2 KB Created: 2020-04-15 06:47:31 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: cdc966273a0a5fa33a1e944fa7b1bc45 SHA-1: 58218293b2300084f5dcac72d1bb1ab8bf485229 SHA-256: 3d26dfb1783b69a7328c71a191f69c5d3b561330d8811620dcea757edcc66f65
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various domains, suggesting a link farm or redirection mechanism. The ML_NYX_PDF_MALICIOUS heuristic also strongly indicates malicious intent. The document body contains garbled text and embedded URLs, further supporting the conclusion that this PDF is designed to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://lakewoodelementary.net/uploads/1/3/1/3/131379306/131379306.html#adnan+ma+hada+iwasum+ne+mp4
    • http://aselcevremetal.com/uploads/1/3/1/4/131482833/wusujogoxoxomu.pdf
    • http://2950cordeliaroad.com/uploads/1/3/0/7/130739126/jenojum.pdf
    • http://leicatestdrive.nl/uploads/1/3/0/4/130436306/mivemageb.pdf
    • http://worldwidefruits.com/uploads/1/3/0/6/130622116/8034c873.pdf
    • http://compatiblehire.com/uploads/1/3/1/3/131384145/magipi.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_off00005253.bin
2c33ab05c2e48137b2472025c21cd239c76798f04e7526f4e2ef5d9ac19a04c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5253 7728 bytes

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