Malicious PDF — malware analysis report

Static analysis result for SHA-256 b54d7828514616e2…

MALICIOUS

PDF

35.6 KB Created: 2020-05-03 12:17:57 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: db3f254e0132421dd6f1e55ee5b21b64 SHA-1: b06199a10a153e0793c0fa2194232a07a433d45b SHA-256: b54d7828514616e28a229c3e1dda3c4891a91e266e254e748512a430f167f216
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 ML_NYX_PDF_MALICIOUS heuristic also flagged this file with high confidence. The embedded URLs suggest a link farm or redirection scheme, likely intended to manipulate search engine results or distribute further malicious content. No scripts were extracted from this sample.

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://mychinesewatch.com/uploads/1/3/1/3/131383652/131383652.html#delacroix+louvre+visite+guidee
    • http://perillianconsulting.com/uploads/1/3/0/8/130874608/eaaf589bf806c04.pdf
    • http://steamsolutionsinc.com/uploads/1/3/0/3/130323750/1222368.pdf
    • http://kickrocks.life/uploads/1/3/0/4/130476740/1215439.pdf
    • http://backcountryportal.net/uploads/1/3/1/4/131437535/vakixabebesuvabur.pdf
    • http://theheardoc.com/uploads/1/3/0/6/130604251/e5065.pdf
    • http://scandinavian-relocation.com/uploads/1/3/0/2/130272609/zopenobawasivewogade.pdf
    • http://terribaxterproperties.net/uploads/1/3/0/5/130589322/c999255c.pdf
    • http://reallashaddicts.com/uploads/1/3/0/6/130620282/3ebd24a4d.pdf
    • http://onthrottlehomeinspections.com/uploads/1/3/0/3/130323116/1842116.pdf
    • http://marigotbayfarm.com/uploads/1/3/1/8/131860204/4fb49.pdf
    • http://digitalstylehouse.com/uploads/1/3/0/9/130969004/rajuzovunak_belume.pdf
    • http://zencandogtraining.com/uploads/1/3/0/8/130814831/3f021dedde9c16e.pdf
    • http://jackielida.com/uploads/1/3/0/4/130476712/e71b2fb9d411.pdf
    • http://designsnathan.com/uploads/1/3/1/6/131637109/wefabupozix.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • 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_off00005bb8.bin
cfada10cf7bd70b0f7fc0c1123edd6897657316e452761851ba4e5e6d28bdf62		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BB8 12344 bytes

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