Malicious PDF — malware analysis report

Static analysis result for SHA-256 406ee852a309b06e…

MALICIOUS

PDF

34.9 KB Created: 2020-04-16 12:17:46 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: dabe6f42b49a74386afc5ed4e5e73798 SHA-1: ae0fdd555dd3f838d1f5f1bf7c2470801c6caf0d SHA-256: 406ee852a309b06e9630ed5ffd8a083301fa58103c311bde3b6ebd4065d279b8
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various PDF files hosted on different domains, suggesting a link farm or distribution network. The ML classifier also strongly indicated maliciousness. The document body contains metadata and a URL that aligns with the link farm activity.

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://mikelopezspeaks.com/uploads/1/3/0/6/130620581/130620581.html#he%27+s+not+here+sheet+music
    • http://artoppt.com/uploads/1/3/1/0/131069961/a065c21.pdf
    • http://soloporque.net/uploads/1/3/1/4/131437683/nufomese-tiwoxitabopiji-nulafilika.pdf
    • http://vacationsbydana-info.com/uploads/1/3/0/6/130604004/8528195.pdf
    • http://beingwithcounsellinglondon.com/uploads/1/3/0/6/130621896/992510.pdf
    • http://fibrowellness.ca/uploads/1/3/1/4/131437131/wipogepiwazole-zafina.pdf
    • http://bowls.ws/uploads/1/3/0/2/130289385/vujujepab.pdf
    • http://worldmetamorphosis.com/uploads/1/3/1/3/131378795/8868641.pdf
    • http://journeyedwarrior.org/uploads/1/3/1/4/131438305/vimikefi_wexugupuv.pdf
    • http://pathwaystohome.net/uploads/1/3/0/7/130775062/lezikowazirar.pdf
    • http://truth-bands.com/uploads/1/3/0/5/130551311/2cd91cd.pdf
    • http://creationcarestudios.com/uploads/1/3/0/8/130813582/datesowinurox.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_off00005e3e.bin
ce570c8bc8a47a966e2d65427ba2e46f9fca345e2d00eccdb5704ea15622752a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E3E 8896 bytes

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