Malicious PDF — malware analysis report

Static analysis result for SHA-256 2925921c35b843e7…

MALICIOUS

PDF

44.0 KB Created: 2020-05-23 06:30:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 155a96c3b8dd48d495446d0c8aa50282 SHA-1: 758c3aaa8702d6eec1ff9e629d678900c17c2211 SHA-256: 2925921c35b843e70baa8d008d2f092c0e37c5b6c8818cfbfe3f61fcb1fef3a7
96 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The document body also contains references to 'Archie comics free app' and lists multiple URLs, suggesting a lure to download or view content. The ML_NYX_PDF_MALICIOUS heuristic further supports the malicious nature of the file. The primary attack pattern involves directing users to potentially malicious websites through these embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9862

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://webmail.ladse.org/uploads/1/3/0/5/130551187/130551187.html#archie+comics+free+app
    • http://remodelacion.org/uploads/1/3/0/2/130291724/gisaderason.pdf
    • http://walnutscandals.com/uploads/1/3/0/8/130814286/3676203a0ccba68.pdf
    • http://theneighborhoodsocial.com/uploads/1/3/0/4/130483153/a95fb86d4496.pdf
    • http://brave-lifestyle.com/uploads/1/3/1/6/131637313/miropawulazelej.pdf
    • http://mta-sts.onlinescrumtraining.nl/uploads/1/3/0/2/130273962/fac95186742.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f19.bin
a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F19 1800 bytes
font_01_sfnt_off000067a5.bin
c651a35af9cbdf6105376371e386e1b09b8d694a4ef249cb9f365dc6603ee4fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67A5 11276 bytes
font_02_sfnt_off00008e5b.bin
a07d64a7634912576cb47d4be898fb2ba110fdc79135a3a611c680d56cc016c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E5B 16748 bytes

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