Malicious PDF — malware analysis report

Static analysis result for SHA-256 44c4e2ee4ebe55ff…

MALICIOUS

PDF

49.2 KB Created: 2020-03-20 05:44:16 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d653e4f5a46d8d868db6983a8df9b897 SHA-1: 4ed48b1cbe9dc3d1e9029c1fbc0da8bb8db1f9ce SHA-256: 44c4e2ee4ebe55ff404bfffe40d5996c41b93564fb6905bc4989ca62237c88c1
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files hosted on different domains. This structure is indicative of a link farm, likely used for SEO manipulation or to distribute malicious content indirectly. The ML classifier strongly supports the malicious verdict, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a mass external link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://rnytee.com/uploads/1/3/0/7/130776249/130776249.html#el+saber+filosofico
    • http://castlerockbakingcompany.com/uploads/1/3/0/8/130814001/rebozinojusalu.pdf
    • http://www.dragonflyphotographyceramics.com/uploads/1/3/0/6/130604803/4525392.pdf
    • http://reasonable-person.com/uploads/1/3/0/6/130621460/74642bfdd2.pdf
    • http://harrellschristianacademy.org/uploads/1/3/0/4/130476908/ce71f7bd.pdf
    • http://www.autoelectrical.co.nz/uploads/1/3/0/5/130543156/figikaxigozamawawela.pdf
    • http://monto.com.mx/uploads/1/3/0/6/130621094/lizek.pdf
    • http://hostmaster.surreysolace.org/uploads/1/3/0/7/130775653/3cb4b568a8bc3.pdf
    • http://mail.sbkbullies.com/uploads/1/3/0/5/130589238/lagojodon-vifepogikovofov.pdf
    • http://antico-hamamatsu.com/uploads/1/3/0/2/130271250/66171824b265d4.pdf
    • http://stemplaystation.com/uploads/1/3/0/7/130739322/f8d59d3cfdfab17.pdf
    • http://thirddraftlife.com/uploads/1/3/0/5/130588452/8644552.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_off0000946f.bin
515c4748548ba5074c0601facfedffe0893ec067a071c79535cab078abacbf57		 pdf-font-stream PDF embedded font (sfnt) at offset 0x946F 9556 bytes

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