Malicious PDF — malware analysis report

Static analysis result for SHA-256 1110de1749122ad4…

MALICIOUS

PDF

37.1 KB Created: 2020-04-06 15:27:31 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 7952390b3fcf9e00622def18604e8a72 SHA-1: b33b71f3d7c98c5d4c9c9236288847ae216d2b13 SHA-256: 1110de1749122ad4465ea335c2280c679266b82fe01f6d0fce310d68e03cda4a
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a significant 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. While no scripts were explicitly extracted, the nature of the links suggests an attempt to redirect users to potentially malicious content or engage in SEO spam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://simplyparadise.org/uploads/1/3/0/5/130544257/130544257.html#la+observacion+en+la+entrevista+psicologica+pdf
    • http://fimbletech.shop/uploads/1/3/1/3/131398348/1103236.pdf
    • http://barrococina.com/uploads/1/3/0/4/130476276/dijax_pafiva_ruxixopubobunu.pdf
    • http://luckky2.com/uploads/1/3/0/5/130551184/6412165.pdf
    • http://mylistingedge.com/uploads/1/3/0/7/130776239/gobijakanuzovuf_nejuvaremojif_papasolemoni.pdf
    • http://cdapaintlessdentrepair.com/uploads/1/3/0/6/130639465/jaxividetosuda-josuranujiruna-jaxusobapup-nipenu.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_off000067e0.bin
723f687cae235a89654389bf087e1ee3a13be1f02f93c4af2769821847387923		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67E0 8288 bytes

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