Malicious PDF — malware analysis report

Static analysis result for SHA-256 e60aae9316c6f0b7…

MALICIOUS

PDF

47.7 KB Created: 2020-04-13 01:41:07 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ba380fd0dc39a8a86077cd8897ed6557 SHA-1: 9e571b68aab2ef01bec8ecf8c0f8513bfa494168 SHA-256: e60aae9316c6f0b77b94c4e01317633bfd49c961b1b8640f72ace4bbb1be210e
92 Risk Score

Malware Insights

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

The PDF contains a large number of external links pointing to other PDF files hosted on various domains. This behavior is indicative of a link farm or a distribution mechanism for further malicious content. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted, and the document body is largely unreadable, but the heuristic firings clearly indicate a malicious intent related to the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://rubiconsociety.com/uploads/1/3/0/6/130605244/130605244.html#relaciona+los+niveles+de+organizaci%C3%B3n+ecol%C3%B3gica+con+sus+caracter%C3%ADsticas
    • http://partinthecarbs.com/uploads/1/3/0/4/130489465/acb19df.pdf
    • http://captainronsrepels.com/uploads/1/3/0/5/130588572/5484000.pdf
    • http://gmjewerly.com/uploads/1/3/1/4/131453810/3092795.pdf
    • http://loomfabricsonline.com/uploads/1/3/0/8/130874539/1174973.pdf
    • http://powerwashingofamerica.com/uploads/1/3/0/5/130590403/koxipobixu.pdf
    • http://consideredthoughtfully.com/uploads/1/3/1/1/131163838/4cf34e63d5109e.pdf
    • http://mimigoesketo.com/uploads/1/3/1/3/131380347/sonopi.pdf
    • http://evokeesthetics.net/uploads/1/3/1/4/131453989/lizaja.pdf
    • http://redlinerealfacts.org/uploads/1/3/0/7/130739269/nafenibilo.pdf
    • http://crookedcracker.com/uploads/1/3/1/3/131380988/mobajetelekeru.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_off00007fb9.bin
a0d0be5eefd041ab07daa9afb8b89086aaea8e72fa30f3f790f92caa5cc8f321		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FB9 9520 bytes
font_01_sfnt_off0000a1ae.bin
d323e9e3ee7aaab432cbbd681f763115d64a1711fa0fc72d56501d4a70dc96f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA1AE 3732 bytes

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