Malicious PDF — malware analysis report

Static analysis result for SHA-256 518bf290cc81706e…

MALICIOUS

PDF

39.8 KB Created: 2020-03-27 02:43:02 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 18efbc4620f76c0a93a29a7cbc8ddda6 SHA-1: 180f4eb650b54f03d0d7d23e580aac430d791b87 SHA-256: 518bf290cc81706e0ffcc6cbb3df934ac21e777213899a6d317e154df7ab344a
94 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to a large number of external PDF files hosted across various domains. The 'PDF_SEO_LINK_FARM' heuristic indicates this is a deliberate link farm, suggesting a traffic redirection scheme or a distribution point for further malicious content. The ML classifier strongly supports the malicious nature of this PDF.

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://greenehempcompany.store/uploads/1/3/0/5/130550783/130550783.html#ejercicios+de+escala+numerica+para+ni%C3%B1os
    • http://lonelycatladiesclub.pet/uploads/1/3/0/5/130551823/ad5b9591b13992c.pdf
    • http://coyoteware.com/uploads/1/3/0/6/130639026/fosedoxuzufisuw.pdf
    • http://www.ezraesl.com/uploads/1/3/0/3/130313212/54aca0ea.pdf
    • http://ipsyhealth.com/uploads/1/3/0/8/130813654/sivufidoferoropurozi.pdf
    • http://floatabovemeyoga.com/uploads/1/3/0/8/130874164/vemiwotiko.pdf
    • http://nicolemarchantintuitive.com/uploads/1/3/0/5/130539113/redilopoxoli-tilufiso.pdf
    • http://samtaylorjewelry.com/uploads/1/3/0/6/130620449/0dcd15.pdf
    • http://southernasphaltmaintenance.net/uploads/1/3/0/7/130776026/8043363.pdf
    • http://ajna-massage.com/uploads/1/3/0/6/130603905/feguzojon.pdf
    • http://stand2serve.net/uploads/1/3/0/7/130775639/bofiperarexokesigemi.pdf
    • http://montessorimentor.org/uploads/1/3/0/7/130739470/jidosufo.pdf
    • http://www.thegatesmillsgardenclub.net/uploads/1/3/1/1/131164269/numabet.pdf
    • http://labcalibrationsllc.com/uploads/1/3/0/5/130589270/2701324.pdf
    • http://bringmorehappy.com/uploads/1/3/0/4/130476981/5a6a255d64b0a2.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_off000066e8.bin
4639891560524440bd55f3a56cb8c24cf3307d8f5ea4c268cb43665db7639ee6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66E8 8464 bytes
font_01_sfnt_off00008614.bin
7466f12abaaa7f3061b2eee0fbea2aff938e674d3fe107531bc2e00f9f0dfbcf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8614 2600 bytes

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