Malicious PDF — malware analysis report

Static analysis result for SHA-256 40ce03b87ba5ccf7…

MALICIOUS

PDF

46.8 KB Created: 2020-04-01 21:07:31 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1f7c913ebb4c2be0ef4ac4ae6a58f0ae SHA-1: ed5f1047e1a42a64bcd961df0b97ddcb8477766a SHA-256: 40ce03b87ba5ccf701045103e9adc6d0975d2a47f2cb40d199c1a1417058b7bf
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The document body, though partially corrupted, includes a URL that is also present in the list of extracted URLs. This suggests a link farm or redirection scheme designed to lead users to potentially malicious content hosted across multiple domains. No scripts were extracted from this sample.

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://guadaluperegionalwellnesscenter.com/uploads/1/3/0/6/130621066/130621066.html#mitoloji+ve+ikonografi+bedrettin+c%C3%B6mert
    • http://jetblackcopywriting.com/uploads/1/3/0/5/130544672/643e0d8e19.pdf
    • http://graysonmichaelbeats.com/uploads/1/3/0/5/130588685/5435575.pdf
    • http://liebenszeichen.com/uploads/1/3/0/6/130604250/6a2e4d25f3.pdf
    • http://scibabooks.org/uploads/1/3/0/6/130621182/dilejanuwixi-dabejigakorisol.pdf
    • http://codarealestateteam.com/uploads/1/3/0/3/130379274/tuliv.pdf
    • http://leiabowls.com/uploads/1/3/0/6/130621096/8515520.pdf
    • http://fiddlersgreenhome.com/uploads/1/3/0/7/130776007/foseginelero_kadulimibefemo_subazatagad.pdf
    • http://limpezasrtclean.pt/uploads/1/3/0/3/130379741/1529386.pdf
    • http://jcdiscovery.com/uploads/1/3/0/5/130590756/b2b116ea3.pdf
    • http://kurekit.com/uploads/1/3/0/3/130313309/kovejagelokub_konuvilipon_sirejavegaro_gizotuxoxotejo.pdf
    • http://rockygrove.org/uploads/1/3/0/7/130775215/lotusalafarasot.pdf
    • http://jwlknives.net/uploads/1/3/0/5/130588867/9d50df.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_off00008a5c.bin
bfd1cf37af7f0151475f10a9feb9701bca3fb729bd28992198449a5c678df2a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A5C 9604 bytes

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