Malicious PDF — malware analysis report

Static analysis result for SHA-256 3df412384d9ebea6…

MALICIOUS

PDF

37.6 KB Created: 2020-06-18 00:39:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9d1187194a86b29f875cf57ea0478d6f SHA-1: c22d45f1034177784f122b51a151f5fb73078855 SHA-256: 3df412384d9ebea6c3503710d0154eaee1b7b50951793af008fd5f99633ae7d6
92 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files hosted on unrelated domains. This behavior is characteristic of a link farm, often used for SEO manipulation or to distribute malicious content. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the suspicious linking pattern. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 3

  • 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
  • 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://d.undesirable.us/uploads/1/3/1/8/131856757/131856757.html#environmental+impact+assessment+guidelines+nsw
    • http://jllcapitalmarketslincolnbp.com/uploads/1/3/0/5/130538875/b2c1b077f2bd6c.pdf
    • http://techmehow.com/uploads/1/3/1/3/131380316/dalojowaturizoz.pdf
    • http://lovercosmetics.com/uploads/1/3/0/6/130620363/7472282.pdf
    • http://msgarletts-hancock.com/uploads/1/3/0/2/130272613/665ffd50e.pdf
    • http://kariongphysiotherapy.com/uploads/1/3/0/5/130588923/2825192.pdf
    • http://graysanatomical.com/uploads/1/3/0/6/130604452/6015b1a0f946b72.pdf
    • http://centralmusicschool.com/uploads/1/3/0/5/130550967/zezugosa.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000543d.bin
b1459c38896d8c84e3f982078ecd5aec3f0cb5295418f68f65e6ac9a40eaf7ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x543D 5384 bytes
font_01_sfnt_off0000667a.bin
c5ce408463796710a04f65eb1c1b3e3867a7e292331ea5e5da0a48cecc10753e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x667A 9932 bytes

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