Malicious PDF — malware analysis report

Static analysis result for SHA-256 248fe16266f494e6…

MALICIOUS

PDF

36.2 KB Created: 2020-04-09 09:23:07 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 25c0214ebd50144a5fee15a387bf9e94 SHA-1: 40c7a65c8c2dc137d2106e9c8aaf765999b5a06e SHA-256: 248fe16266f494e629d086f27213b2c68101f5508c93392e5540641333051619
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links to other PDF files hosted on various domains, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier also flagged this PDF as malicious with high confidence. The document body contains garbled text but also includes the URL http://rochecenter.org/uploads/1/3/0/2/130270796/130270796.html#manifest+sons+of+god+scripture, which is also listed among the extracted URLs. The primary function appears to be directing users to a link farm, likely for SEO manipulation or to serve as a distribution point for further malicious payloads.

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://rochecenter.org/uploads/1/3/0/2/130270796/130270796.html#manifest+sons+of+god+scripture
    • http://thestorystudiohk.com/uploads/1/3/0/4/130476624/bad83a770572084.pdf
    • http://perisjewelry.com/uploads/1/3/1/4/131413418/55803.pdf
    • http://rbtlbookclub.com/uploads/1/3/0/6/130639025/naduliwuz.pdf
    • http://valkyriegallery.com/uploads/1/3/0/4/130477090/6420830.pdf
    • http://transcontinenta.eu/uploads/1/3/0/2/130273576/mabujasare_gedivepodevedu_fivuzeg.pdf
    • http://beathawellness.com/uploads/1/3/0/7/130738568/6422626.pdf
    • http://yummymummycookieco.com/uploads/1/3/0/5/130550700/3793086.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_off000067c4.bin
a0433344d28c2a04aeb97762881fc57c949b77da670163fa4bbfaf03951338c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67C4 7180 bytes

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