Malicious PDF — malware analysis report

Static analysis result for SHA-256 c021d4782958c327…

MALICIOUS

PDF

35.1 KB Created: 2020-06-03 00:49:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d6d7251caa009ecc7d10e09dec92fc7f SHA-1: 4aa090ccbc7fe0e5fc62e0d4e349cac278e96c5c SHA-256: c021d4782958c327a31707171740a1f83a8be3179a049af7441178c3556b2935
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, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier also flagged the PDF as malicious with high confidence. The document body, though heavily obfuscated, contains several URLs that are also present in the heuristics, suggesting a coordinated effort to link to external resources. The primary attack pattern appears to be the creation of a link farm, likely for SEO manipulation or to distribute further malicious content via the linked PDFs.

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://njwxc.com/uploads/1/3/0/6/130639721/130639721.html#pebble+watch+round
    • http://propertymaintenancellc.net/uploads/1/3/0/7/130739530/jumutojopalubif.pdf
    • http://heavenlyimagessounds.com/uploads/1/3/0/7/130775118/67555.pdf
    • http://4n4.undesirable.us/uploads/1/3/0/5/130541624/6022784.pdf
    • http://retrodrmllc.shop/uploads/1/3/0/2/130271080/datupegewoju-pimisujuzivojaj.pdf
    • http://pikmetoday.com/uploads/1/3/0/5/130588461/1693454.pdf
    • http://njwxc.com/uploads/1/3/0/6/130639721/terms.html
    • http://njwxc.com/uploads/1/3/0/6/130639721/dmca.html
    • http://njwxc.com/uploads/1/3/0/6/130639721/policy.html
    • https://zadidepetox.files.wordpress.com/2020/06/revimon.pdf
    • https://porugisi.files.wordpress.com/2020/05/dapisenuvajofagobelufesas.pdf
    • https://juxisaw.files.wordpress.com/2020/05/merozerivowaronuv.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_off00005f78.bin
89316416e7c2ef8c2668b83a8a9d4c977207dbf05f7faf0ab13b593ecc62038a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F78 9984 bytes

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